一 fact变量
1.1 fact简介
ansible有一个模块叫setup，用于获取远程主机的相关信息，并可以将这些信息作为变量在playbook里进行调用。而setup模块获取这些信息的方法就是依赖于fact。
[root@node1 ansible]# ansible demo2.example.com -m setup
demo2.example.com | SUCCESS => { "ansible_facts": { "ansible_all_ipv4_addresses": [ "192.168.132.132" ], "ansible_all_ipv6_addresses": [ "fe80::6a92:62ba:1b33:c93d" ], "ansible_apparmor": { "status": "disabled" }, "ansible_architecture": "x86_64", "ansible_bios_date": "04/13/2018", "ansible_bios_version": "6.00", "ansible_cmdline": { "BOOT_IMAGE": "/vmlinuz-3.10.0-957.27.2.el7.x86_64", "LANG": "en_US.UTF-8", "crashkernel": "auto", "quiet": true, "rd.lvm.lv": "centos/swap", "rhgb": true, "ro": true, "root": "/dev/mapper/centos-root" }, "ansible_date_time": { "date": "2020-04-30", "day": "30", "epoch": "1588215058", "hour": "10", "iso8601": "2020-04-30T02:50:58Z", "iso8601_basic": "20200430T105058313014", "iso8601_basic_short": "20200430T105058", "iso8601_micro": "2020-04-30T02:50:58.313109Z", "minute": "50", "month": "04", "second": "58", "time": "10:50:58", "tz": "CST", "tz_offset": "+0800", "weekday": "Thursday", "weekday_number": "4", "weeknumber": "17", "year": "2020" }, "ansible_default_ipv4": { "address": "192.168.132.132", "alias": "ens33", "broadcast": "192.168.132.255", "gateway": "192.168.132.2", "interface": "ens33", "macaddress": "00:0c:29:63:fd:11", "mtu": 1500, "netmask": "255.255.255.0", "network": "192.168.132.0", "type": "ether" }, "ansible_default_ipv6": {}, "ansible_device_links": { "ids": { "dm-0": [ "dm-name-centos-root", "dm-uuid-LVM-DOPPciSmMTXQSQJvRdSbWJBmuhdeD9S0AS74ZZdHMVJnlz1YUctYK3lKDmZnrRhM" ], "dm-1": [ "dm-name-centos-swap", "dm-uuid-LVM-DOPPciSmMTXQSQJvRdSbWJBmuhdeD9S04iSoOFGXPLXY22VMgaQAGIOSYqrk66ql" ], "sda2": [ "lvm-pv-uuid-bvlLLc-vsnl-w4tp-yxSU-WAvm-0OzC-plOsdY" ], "sr0": [ "ata-VMware_Virtual_IDE_CDROM_Drive_10000000000000000001" ] }, "labels": {}, "masters": { "sda2": [ "dm-0", "dm-1" ] }, "uuids": { "dm-0": [ "ef36deb2-4eae-40f6-824c-fb1ac0d1e009" ], "dm-1": [ "1d0baec2-b571-4581-acbc-4462a915c751" ], "sda1": [ "2c23c58e-cec4-4606-8210-ae4e5ec62133" ] } }, "ansible_devices": { "dm-0": { "holders": [], "host": "", "links": { "ids": [ "dm-name-centos-root", "dm-uuid-LVM-DOPPciSmMTXQSQJvRdSbWJBmuhdeD9S0AS74ZZdHMVJnlz1YUctYK3lKDmZnrRhM" ], "labels": [], "masters": [], "uuids": [ "ef36deb2-4eae-40f6-824c-fb1ac0d1e009" ] }, "model": null, "partitions": {}, "removable": "0", "rotational": "1", "sas_address": null, "sas_device_handle": null, "scheduler_mode": "", "sectors": "98549760", "sectorsize": "512", "size": "46.99 GB", "support_discard": "0", "vendor": null, "virtual": 1 }, "dm-1": { "holders": [], "host": "", "links": { "ids": [ "dm-name-centos-swap", "dm-uuid-LVM-DOPPciSmMTXQSQJvRdSbWJBmuhdeD9S04iSoOFGXPLXY22VMgaQAGIOSYqrk66ql" ], "labels": [], "masters": [], "uuids": [ "1d0baec2-b571-4581-acbc-4462a915c751" ] }, "model": null, "partitions": {}, "removable": "0", "rotational": "1", "sas_address": null, "sas_device_handle": null, "scheduler_mode": "", "sectors": "4194304", "sectorsize": "512", "size": "2.00 GB", "support_discard": "0", "vendor": null, "virtual": 1 }, "sda": { "holders": [], "host": "", "links": { "ids": [], "labels": [], "masters": [], "uuids": [] }, "model": "VMware Virtual S", "partitions": { "sda1": { "holders": [], "links": { "ids": [], "labels": [], "masters": [], "uuids": [ "2c23c58e-cec4-4606-8210-ae4e5ec62133" ] }, "sectors": "2097152", "sectorsize": 512, "size": "1.00 GB", "start": "2048", "uuid": "2c23c58e-cec4-4606-8210-ae4e5ec62133" }, "sda2": { "holders": [ "centos-root", "centos-swap" ], "links": { "ids": [ "lvm-pv-uuid-bvlLLc-vsnl-w4tp-yxSU-WAvm-0OzC-plOsdY" ], "labels": [], "masters": [ "dm-0", "dm-1" ], "uuids": [] }, "sectors": "102758400", "sectorsize": 512, "size": "49.00 GB", "start": "2099200", "uuid": null } }, "removable": "0", "rotational": "1", "sas_address": null, "sas_device_handle": null, "scheduler_mode": "deadline", "sectors": "104857600", "sectorsize": "512", "size": "50.00 GB", "support_discard": "0", "vendor": "VMware,", "virtual": 1 }, "sr0": { "holders": [], "host": "", "links": { "ids": [ "ata-VMware_Virtual_IDE_CDROM_Drive_10000000000000000001" ], "labels": [], "masters": [], "uuids": [] }, "model": "VMware IDE CDR10", "partitions": {}, "removable": "1", "rotational": "1", "sas_address": null, "sas_device_handle": null, "scheduler_mode": "deadline", "sectors": "2097151", "sectorsize": "512", "size": "1024.00 MB", "support_discard": "0", "vendor": "NECVMWar", "virtual": 1 } }, "ansible_distribution": "CentOS", "ansible_distribution_file_parsed": true, "ansible_distribution_file_path": "/etc/redhat-release", "ansible_distribution_file_variety": "RedHat", "ansible_distribution_major_version": "7", "ansible_distribution_release": "Core", "ansible_distribution_version": "7.7", "ansible_dns": { "nameservers": [ "8.8.8.8" ] }, "ansible_domain": "", "ansible_effective_group_id": 0, "ansible_effective_user_id": 0, "ansible_ens33": { "active": true, "device": "ens33", "features": { "busy_poll": "off [fixed]", "fcoe_mtu": "off [fixed]", "generic_receive_offload": "on", "generic_segmentation_offload": "on", "highdma": "off [fixed]", "hw_tc_offload": "off [fixed]", "l2_fwd_offload": "off [fixed]", "large_receive_offload": "off [fixed]", "loopback": "off [fixed]", "netns_local": "off [fixed]", "ntuple_filters": "off [fixed]", "receive_hashing": "off [fixed]", "rx_all": "off", "rx_checksumming": "off", "rx_fcs": "off", "rx_gro_hw": "off [fixed]", "rx_udp_tunnel_port_offload": "off [fixed]", "rx_vlan_filter": "on [fixed]", "rx_vlan_offload": "on", "rx_vlan_stag_filter": "off [fixed]", "rx_vlan_stag_hw_parse": "off [fixed]", "scatter_gather": "on", "tcp_segmentation_offload": "on", "tx_checksum_fcoe_crc": "off [fixed]", "tx_checksum_ip_generic": "on", "tx_checksum_ipv4": "off [fixed]", "tx_checksum_ipv6": "off [fixed]", "tx_checksum_sctp": "off [fixed]", "tx_checksumming": "on", "tx_fcoe_segmentation": "off [fixed]", "tx_gre_csum_segmentation": "off [fixed]", "tx_gre_segmentation": "off [fixed]", "tx_gso_partial": "off [fixed]", "tx_gso_robust": "off [fixed]", "tx_ipip_segmentation": "off [fixed]", "tx_lockless": "off [fixed]", "tx_nocache_copy": "off", "tx_scatter_gather": "on", "tx_scatter_gather_fraglist": "off [fixed]", "tx_sctp_segmentation": "off [fixed]", "tx_sit_segmentation": "off [fixed]", "tx_tcp6_segmentation": "off [fixed]", "tx_tcp_ecn_segmentation": "off [fixed]", "tx_tcp_mangleid_segmentation": "off", "tx_tcp_segmentation": "on", "tx_udp_tnl_csum_segmentation": "off [fixed]", "tx_udp_tnl_segmentation": "off [fixed]", "tx_vlan_offload": "on [fixed]", "tx_vlan_stag_hw_insert": "off [fixed]", "udp_fragmentation_offload": "off [fixed]", "vlan_challenged": "off [fixed]" }, "hw_timestamp_filters": [], "ipv4": { "address": "192.168.132.132", "broadcast": "192.168.132.255", "netmask": "255.255.255.0", "network": "192.168.132.0" }, "ipv6": [ { "address": "fe80::6a92:62ba:1b33:c93d", "prefix": "64", "scope": "link" } ], "macaddress": "00:0c:29:63:fd:11", "module": "e1000", "mtu": 1500, "pciid": "0000:02:01.0", "promisc": false, "speed": 1000, "timestamping": [ "tx_software", "rx_software", "software" ], "type": "ether" }, "ansible_env": { "HOME": "/root", "LANG": "C", "LC_ALL": "C", "LC_NUMERIC": "C", "LOGNAME": "root", "LS_COLORS": "rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=01;05;37;41:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.axv=01;35:*.anx=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=01;36:*.au=01;36:*.flac=01;36:*.mid=01;36:*.midi=01;36:*.mka=01;36:*.mp3=01;36:*.mpc=01;36:*.ogg=01;36:*.ra=01;36:*.wav=01;36:*.axa=01;36:*.oga=01;36:*.spx=01;36:*.xspf=01;36:", "MAIL": "/var/mail/ansible", "PATH": "/sbin:/bin:/usr/sbin:/usr/bin", "PWD": "/home/ansible", "SHELL": "/bin/bash", "SHLVL": "1", "SUDO_COMMAND": "/bin/sh -c echo BECOME-SUCCESS-kalsgttbdyavwerspucrqragxtbzcurx ; /usr/bin/python /home/ansible/.ansible/tmp/ansible-tmp-1588215056.77-165714705580753/AnsiballZ_setup.py", "SUDO_GID": "1001", "SUDO_UID": "1001", "SUDO_USER": "ansible", "TERM": "xterm", "USER": "root", "USERNAME": "root", "XDG_SESSION_ID": "1914", "_": "/usr/bin/python" }, "ansible_fibre_channel_wwn": [], "ansible_fips": false, "ansible_form_factor": "Other", "ansible_fqdn": "node2", "ansible_hostname": "node2", "ansible_hostnqn": "", "ansible_interfaces": [ "lo", "ens33" ], "ansible_is_chroot": false, "ansible_iscsi_iqn": "", "ansible_kernel": "3.10.0-957.27.2.el7.x86_64", "ansible_kernel_version": "#1 SMP Mon Jul 29 17:46:05 UTC 2019", "ansible_lo": { "active": true, "device": "lo", "features": { "busy_poll": "off [fixed]", "fcoe_mtu": "off [fixed]", "generic_receive_offload": "on", "generic_segmentation_offload": "on", "highdma": "on [fixed]", "hw_tc_offload": "off [fixed]", "l2_fwd_offload": "off [fixed]", "large_receive_offload": "off [fixed]", "loopback": "on [fixed]", "netns_local": "on [fixed]", "ntuple_filters": "off [fixed]", "receive_hashing": "off [fixed]", "rx_all": "off [fixed]", "rx_checksumming": "on [fixed]", "rx_fcs": "off [fixed]", "rx_gro_hw": "off [fixed]", "rx_udp_tunnel_port_offload": "off [fixed]", "rx_vlan_filter": "off [fixed]", "rx_vlan_offload": "off [fixed]", "rx_vlan_stag_filter": "off [fixed]", "rx_vlan_stag_hw_parse": "off [fixed]", "scatter_gather": "on", "tcp_segmentation_offload": "on", "tx_checksum_fcoe_crc": "off [fixed]", "tx_checksum_ip_generic": "on [fixed]", "tx_checksum_ipv4": "off [fixed]", "tx_checksum_ipv6": "off [fixed]", "tx_checksum_sctp": "on [fixed]", "tx_checksumming": "on", "tx_fcoe_segmentation": "off [fixed]", "tx_gre_csum_segmentation": "off [fixed]", "tx_gre_segmentation": "off [fixed]", "tx_gso_partial": "off [fixed]", "tx_gso_robust": "off [fixed]", "tx_ipip_segmentation": "off [fixed]", "tx_lockless": "on [fixed]", "tx_nocache_copy": "off [fixed]", "tx_scatter_gather": "on [fixed]", "tx_scatter_gather_fraglist": "on [fixed]", "tx_sctp_segmentation": "on", "tx_sit_segmentation": "off [fixed]", "tx_tcp6_segmentation": "on", "tx_tcp_ecn_segmentation": "on", "tx_tcp_mangleid_segmentation": "on", "tx_tcp_segmentation": "on", "tx_udp_tnl_csum_segmentation": "off [fixed]", "tx_udp_tnl_segmentation": "off [fixed]", "tx_vlan_offload": "off [fixed]", "tx_vlan_stag_hw_insert": "off [fixed]", "udp_fragmentation_offload": "on", "vlan_challenged": "on [fixed]" }, "hw_timestamp_filters": [], "ipv4": { "address": "127.0.0.1", "broadcast": "host", "netmask": "255.0.0.0", "network": "127.0.0.0" }, "ipv6": [ { "address": "::1", "prefix": "128", "scope": "host" } ], "mtu": 65536, "promisc": false, "timestamping": [ "rx_software", "software" ], "type": "loopback" }, "ansible_local": {}, "ansible_lsb": {}, "ansible_lvm": { "lvs": { "root": { "size_g": "46.99", "vg": "centos" }, "swap": { "size_g": "2.00", "vg": "centos" } }, "pvs": { "/dev/sda2": { "free_g": "0.00", "size_g": "49.00", "vg": "centos" } }, "vgs": { "centos": { "free_g": "0.00", "num_lvs": "2", "num_pvs": "1", "size_g": "49.00" } } }, "ansible_machine": "x86_64", "ansible_machine_id": "817ad910bace4109bda4f5dc5c709092", "ansible_memfree_mb": 299, "ansible_memory_mb": { "nocache": { "free": 1455, "used": 364 }, "real": { "free": 299, "total": 1819, "used": 1520 }, "swap": { "cached": 0, "free": 2046, "total": 2047, "used": 1 } }, "ansible_memtotal_mb": 1819, "ansible_mounts": [ { "block_available": 205371, "block_size": 4096, "block_total": 259584, "block_used": 54213, "device": "/dev/sda1", "fstype": "xfs", "inode_available": 523945, "inode_total": 524288, "inode_used": 343, "mount": "/boot", "options": "rw,relatime,attr2,inode64,noquota", "size_available": 841199616, "size_total": 1063256064, "uuid": "2c23c58e-cec4-4606-8210-ae4e5ec62133" }, { "block_available": 11751659, "block_size": 4096, "block_total": 12312705, "block_used": 561046, "device": "/dev/mapper/centos-root", "fstype": "xfs", "inode_available": 24571916, "inode_total": 24637440, "inode_used": 65524, "mount": "/", "options": "rw,relatime,attr2,inode64,noquota", "size_available": 48134795264, "size_total": 50432839680, "uuid": "ef36deb2-4eae-40f6-824c-fb1ac0d1e009" } ], "ansible_nodename": "node2", "ansible_os_family": "RedHat", "ansible_pkg_mgr": "yum", "ansible_proc_cmdline": { "BOOT_IMAGE": "/vmlinuz-3.10.0-957.27.2.el7.x86_64", "LANG": "en_US.UTF-8", "crashkernel": "auto", "quiet": true, "rd.lvm.lv": [ "centos/root", "centos/swap" ], "rhgb": true, "ro": true, "root": "/dev/mapper/centos-root" }, "ansible_processor": [ "0", "GenuineIntel", "Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz", "1", "GenuineIntel", "Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz", "2", "GenuineIntel", "Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz", "3", "GenuineIntel", "Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz" ], "ansible_processor_cores": 2, "ansible_processor_count": 2, "ansible_processor_threads_per_core": 1, "ansible_processor_vcpus": 4, "ansible_product_name": "VMware Virtual Platform", "ansible_product_serial": "VMware-56 4d 88 88 a7 86 38 42-f2 d9 58 02 e1 63 fd 11", "ansible_product_uuid": "88884D56-86A7-4238-F2D9-5802E163FD11", "ansible_product_version": "None", "ansible_python": { "executable": "/usr/bin/python", "has_sslcontext": true, "type": "CPython", "version": { "major": 2, "micro": 5, "minor": 7, "releaselevel": "final", "serial": 0 }, "version_info": [ 2, 7, 5, "final", 0 ] }, "ansible_python_version": "2.7.5", "ansible_real_group_id": 0, "ansible_real_user_id": 0, "ansible_selinux": { "status": "disabled" }, "ansible_selinux_python_present": true, "ansible_service_mgr": "systemd", "ansible_ssh_host_key_ecdsa_public": "AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBMiIcHrss0DX+TBpGMOnQM8dO9LSZnI5QrANTegeCywBZBiYglYYLZWkZXRRlnEYAUTy9yPFx+tInTl2Bbo+RxA=", "ansible_ssh_host_key_ed25519_public": "AAAAC3NzaC1lZDI1NTE5AAAAIJf28PYx30H/aUjwMBCXHZQseLByG1UYXrUgftwMEsWa", "ansible_ssh_host_key_rsa_public": "AAAAB3NzaC1yc2EAAAADAQABAAABAQDI3Bc9IkpKs0gwrgB+Iu5Ao4sqBypnzGvkR23ryMk3mkqob1rdL9FEbUnFnUcMRY4WgbLr+TzUxIRUHLKuJX3uMbfuQrYz14EVTTck7PQIJ1X6AoHRK462cZxzvekHYxUxsKSuGg64UAEf7UoXM7Zghfm6Y0gF0CSmnLQzCD6PDmdhAfteV8JVTxTGKzKX02/fnrDrvqpcGeEo3vFCWEdrrlAKAu5j8llbq6BghRi7+6h+cEI3qAjJkpWB9fnVXDUUqKJh3WuR7lhcXaD7NLVHiw2JEtOhZlkQEQMFHCQNDo0+fhHCNVPKybt/Zt1X1VvpocqcUIBJIYMdRXdhwXLR", "ansible_swapfree_mb": 2046, "ansible_swaptotal_mb": 2047, "ansible_system": "Linux", "ansible_system_capabilities": [ "cap_chown", "cap_dac_override", "cap_dac_read_search", "cap_fowner", "cap_fsetid", "cap_kill", "cap_setgid", "cap_setuid", "cap_setpcap", "cap_linux_immutable", "cap_net_bind_service", "cap_net_broadcast", "cap_net_admin", "cap_net_raw", "cap_ipc_lock", "cap_ipc_owner", "cap_sys_module", "cap_sys_rawio", "cap_sys_chroot", "cap_sys_ptrace", "cap_sys_pacct", "cap_sys_admin", "cap_sys_boot", "cap_sys_nice", "cap_sys_resource", "cap_sys_time", "cap_sys_tty_config", "cap_mknod", "cap_lease", "cap_audit_write", "cap_audit_control", "cap_setfcap", "cap_mac_override", "cap_mac_admin", "cap_syslog", "35", "36+ep" ], "ansible_system_capabilities_enforced": "True", "ansible_system_vendor": "VMware, Inc.", "ansible_uptime_seconds": 270556, "ansible_user_dir": "/root", "ansible_user_gecos": "root", "ansible_user_gid": 0, "ansible_user_id": "root", "ansible_user_shell": "/bin/bash", "ansible_user_uid": 0, "ansible_userspace_architecture": "x86_64", "ansible_userspace_bits": "64", "ansible_virtualization_role": "guest", "ansible_virtualization_type": "VMware", "discovered_interpreter_python": "/usr/bin/python", "gather_subset": [ "all" ], "module_setup": true }, "changed": false }
在执行palybook时，有一个打印信息
TASK [Gathering Facts] ************************************************************************************************************************
ok: [demo5.example.com]
每次执行的时候，会有很多时间来获取这个变量，可以关闭这个操作
- hosts: demo5.example.com gather_facts: false vars_files: - users.yml tasks: - debug: var: users.natash.0.hobby.0 - debug: msg: "{{ users.tom.0.hobby }}" - debug: msg: "{{ users['tom'][0]['hobby'] }}"
setup获取的这些信息，都是可用于该主机的变量。
使用方法和其他变量一样
- hosts: demo5.example.com #gather_facts: false vars_files: - users.yml tasks: - debug: msg: "{{ ansible_os_family }}"
执行
PLAY [demo5.example.com] ********************************************************************************************************************** TASK [Gathering Facts] ************************************************************************************************************************ ok: [demo5.example.com] TASK [debug] ********************************************************************************************************************************** ok: [demo5.example.com] => { "msg": "RedHat" } PLAY RECAP ************************************************************************************************************************************ demo5.example.com : ok=2 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
1.2 手动设置fact
ansible除了能获取到预定义的fact的内容,还支持手动为某个主机定制fact。称之为本地fact。本地fact默认存放于被控端的/etc/ansible/facts.d目录下，如果文件为ini格式或者json格式，ansible会自动识别。以这种形式加载的fact是key为ansible_local的特殊变量。
下面是一个简单的示例，在ansibler主控端定义一个ini格式的custom.fact文件内容如下
[root@node1 ansible]# vim custom.fact
[general] package = httpd service = httpd state = started
[root@node1 ansible]# vim push_facts.yml
- hosts: demo2.example.com tasks: - file: path: /etc/ansible/facts.d state: directory - copy: src: ./custom.fact dest: /etc/ansible/facts.d
[root@node1 ansible]# ansible-playbook push_facts.yml
PLAY [demo2.example.com] ********************************************************************************************************************** TASK [Gathering Facts] ************************************************************************************************************************ ok: [demo2.example.com] TASK [file] *********************************************************************************************************************************** changed: [demo2.example.com] TASK [copy] *********************************************************************************************************************************** changed: [demo2.example.com] PLAY RECAP ************************************************************************************************************************************ demo2.example.com : ok=3 changed=2 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
[root@node1 ansible]# ansible demo2.example.com -m setup -a "filter=ansible_local"
demo2.example.com | SUCCESS => { "ansible_facts": { "ansible_local": { "custom": { "general": { "package": "httpd", "service": "httpd", "state": "started" } } }, "discovered_interpreter_python": "/usr/bin/python" }, "changed": false }
调用这个变量·
[root@node1 ansible]# vim use_users.yml
- hosts: demo2.example.com #gather_facts: false vars_files: - users.yml tasks: - debug: msg: "{{ ansible_os_family }}" - debug: msg: "{{ ansible_local.custom.general.package }}"
[root@node1 ansible]# ansible-playbook use_users.yml
TASK [debug] ********************************************************************************************************************************** ok: [demo2.example.com] => { "msg": "RedHat" } TASK [debug] ********************************************************************************************************************************** ok: [demo2.example.com] => { "msg": "httpd" }
1.3 使用set_fact模块定义新的变量
set_fact模块可以自定义facts，这些自定义的facts可以通过template或者变量的方式在playbook中使用。如果你想要获取一个进程使用的内存的百分比，则必须通过set_fact来进行计算之后得出其值，并将其值在playbook中引用。
下面是一个set_fact模块的应用示例：
[root@node1 ansible]# cat set_fact_ex.yml
- name: set_fact example hosts: demo2.example.com tasks: - name: set facts set_fact: aaa=bbb - debug: msg: "{{ aaa }}"
[root@node1 ansible]# ansible-playbook set_fact_ex.yml
TASK [debug] ********************************************************************************************************************************** ok: [demo2.example.com] => { "msg": "bbb" }
[root@node1 ansible]# vim set_fact_ex.yml
- name: set_fact example hosts: demo2.example.com tasks: - name: set facts set_fact: aaa=bbb - debug: msg: "{{ ansible_memtotal_mb }}"
root@node1 ansible]# ansible-playbook set_fact_ex.yml
TASK [debug] ********************************************************************************************************************************** ok: [demo2.example.com] => { "msg": 1819 }
使用计算方式，获取一个值
[root@node1 ansible]# cat set_fact_ex.yml
- name: set_fact example hosts: demo2.example.com tasks: - name: set facts set_fact: half_memetotal={{ ansible_memtotal_mb/2 |int }} - debug: msg: "{{ half_memetotal }}"
执行
[root@node1 ansible]# ansible-playbook set_fact_ex.yml
TASK [debug] ********************************************************************************************************************************** ok: [demo2.example.com] => { "msg": "909.5" }
1.4 手动采集fact
通常情况下，我们在运行play的时候，ansible会先尝试ssh到被控端采集fact，如果此时，被控制端的ssh还没有完全启动，就会导致整个play执行失败。这个时候，我们可以先显示的关闭fact采集，然后在task中通过wait_for等待被控端ssh端口被正常监听，再在task中使用setup模块来手动采集fact：
- name: Deploy apps hosts: webservers gather_facts: False tasks： - name: wait for ssh to be running local_action: wait_for port=22 host="{{ inventory_hostname }}" search_regex=OpenSSH - name: gather facts setup:
......
1.5 启用fact缓存
如果在play中需要引入fact，则可以开启fact缓存。fact缓存目前支持三种存储方式，分别为JSON、memcached、redis。
1. Json文件fact缓存后端
使用JSON文件作为fact缓存后端的时候，ansible将会把采集的fact写入到控制主机的文件中。
[root@node1 ansible]# vim ansible.cfg
[defaults] gathering = smart #缓存时间，单位为秒 fact_caching_timeout = 86400 fact_caching = jsonfile #指定ansible包含fact的json文件位置，如果目录不存在，会自动创建 fact_caching_connection = /tmp/ansible_fact_cache
选项说明:
- gathering:是否启用fact，有三个选项
-
- sunart:默认收集 facts，但在 facts已有的情况下就不收集，即使用 facts缓存
- implicit:默认收集 facts，要禁止收集，必须显式的申明: gather facts: false
- explicit:默认不收集，要收集，必须显示的申明: gather facts:true
- fact cacheing timeout:缓存时间，单位为s
- fact caching:缓存的方式，支持 jsonfile、 redis、 memcached
- fact caching connection:指定 ansible缓存fac的连接方式，如果是 jsonfile，则指定 jsonfile的缓存路径
[root@node1 ansible]# mkdir /tmp/ansible_fact_cache
root@node1 ansible]#ansible-playbook set_fact_ex.yml
[root@node1 ansible]# cat /tmp/ansible_fact_cache/demo2.example.com
这里存放就是fact相关的缓存
2 Redis fact缓存后端
使用redis作为fact缓存后端，需要在控制主机上安装redis服务并保持运行。需要安装python操作redis的软件包。
ansible.cfg配置如下：
[defaults] gathering = smart fact_caching_timeout = 86400 fact_caching = redis
3 Memcached fact缓存后端
使用memcached作为fact缓存后端，需要在控制主机上安装Memcached服务并保持运行，需要安装python操作memcached的软件包。
ansible.cfg配置如下：
[defaults] gathering = smart fact_caching_timeout = 86400 fact_caching = memcached
二 魔法变量
Ansible默认会提供一些内置的变量以实现一些特定的功能，我们称之为魔法变量。下面列举一些常用的魔法变量。
2.1 hostvars
获取某台指定的主机的相关变量。如果有一台web服务器的配置文件中需要指定db服务器的ip地址，我们假定这台db服务器的hostname为db.exmaple.com,ip地址绑定在eth0网卡上，我们可以通过如下方法在web服务器上调用db服务器的ip地址：
[root@node1 ansible]# vim var_test.yml
- hosts: demo2.example.com tasks: - debug: msg: "{{ ansible_ens33.ipv4.address }}"
[root@node1 ansible]# ansible-playbook var_test.yml
TASK [debug] ********************************************************************************************************************************** ok: [demo2.example.com] => { "msg": "192.168.132.132" #这里获取的demo2.example.com }
获取demo3.example.com的地址
- hosts: demo2.example.com tasks: - debug: msg: "{{ hostvars['demo3.example.com'].ansible_ens33.ipv4.address }}"
[root@node1 ansible]# ansible-playbook var_test.yml
TASK [debug] ********************************************************************************************************************************** ok: [demo2.example.com] => { "msg": "192.168.132.133" }
2.2 inventory_hostname
inventory_hostname是Ansible所识别的当前正在运行task的主机的主机名。如果在inventory里定义过别名，那么这里就是那个别名，如果inventory包含如下一行：
demo6.example.com ansible_ssh_host=192.168.132.132
则inventory_hostname即为demo6.example.com
利用hostvars和inventory_hostname变量，可以输出与当前主机相关联的所有变量：
[root@node1 ansible]# vim var_test.yml
- hosts: demo6.example.com tasks: - debug: msg: "{{ inventory_hostname }}" - debug: msg: "{{ ansible_fqdn }}"
[root@node1 ansible]# ansible-playbook var_test.yml
TASK [debug] ********************************************************************************************************************************** ok: [demo6.example.com] => { "msg": "demo6.example.com" #别名
} TASK [debug] ********************************************************************************************************************************** ok: [demo6.example.com] => { "msg": "node2" #获取了本身的hostname
}
2.3 group_names
用于标识当前正在执行task的目标主机位于的主机组。假如我们有三台主机，用来配置成一主二从的mysql服务器。inventory配置如下：
demo6.example.com ansible_ssh_host=192.168.132.132 demo5.example.com demo3.example.com [datacenter1] demo1.example.com demo2.example.com [datacenter2] demo3.example.com demo4.example.com [webserver] demo1.example.com demo2.example.com demo3.example.com [mysqlserver] demo4.example.com demo5.example.com [datacenters:children] datacenter1 datacenter2
[root@node1 ansible]# vim group_name.yml
- hosts: all tasks: - debug: msg: "{{ group_names }}"
[root@node1 ansible]# ansible-playbook group_name.yml
ok: [demo6.example.com] => { "msg": [ "ungrouped" ] } ok: [demo4.example.com] => { "msg": [ "datacenter2", "datacenters", "mysqlserver" ] } ok: [demo5.example.com] => { "msg": [ "mysqlserver" ] } ok: [demo1.example.com] => { "msg": [ "datacenter1", "datacenters", "webserver" ] } ok: [demo2.example.com] => { "msg": [ "datacenter1", "datacenters", "webserver" ] } ok: [demo3.example.com] => { "msg": [ "datacenter2", "datacenters", "webserver" ] }
2.4 groups
groups是inventory中所有主机组的列表，可用于枚举主机组中的所有主机。
[root@node1 ansible]# vim group_name.yml
- hosts: demo2.example.com tasks: - debug: msg: "{{ groups.webserver }}"
[root@node1 ansible]# ansible-playbook group_name.yml
TASK [debug] ********************************************************************************************************************************** ok: [demo2.example.com] => { "msg": [ "demo1.example.com", "demo2.example.com", "demo3.example.com" ] }
应用场景，需要把一组下面的被控端都安装配置文件
[root@node1 ansible]# cat files/haproxy.cfg
{% for i in groups.webserver%}
server {{ i }};
{% endfor %}
[root@node1 ansible]# vim group_name.yml
- hosts: demo2.example.com tasks: - package: name: haproxy state: installed - template: src: ./files/haproxy.cfg dest: /etc/haproxy.cgf
执行
[root@node1 ansible]# ansible-playbook group_name.yml
[root@node1 ansible]# ansible demo2.example.com -m shell -a 'cat /tmp/haproxy.cgf'
demo2.example.com | CHANGED | rc=0 >> server demo1.example.com; server demo2.example.com; server demo3.example.com;
2.5 其他变量
1 play_hosts
当前playbook会在哪些hosts上运行
2. inventory_dir
主机清单所在目录
3. inventory_file
主机清单文件
2.6 变量优先级
1. extra vars（命令中-e）最优先
2 inventory主机清单中连接变量（ ansible ssh user等）
3.play中vars、 vars files等
4.剩余的在 Inventory中定义的变量
5.系统的 facts变量
6.角色走义的默认变量 roles/ rolesname/ defaults/ main ym）
三 使用lookup生成变量
3.1 简单说明
在通常情况下，所有的配置信息都会被作为ansible的变量保存了，而且可以保存在ansible允许定义变量的各种地方，诸如vars区段，vars_files加载的文件中，以及host_vars和group_vars目录中。
但在有些时候，我们希望从诸如文本文件或者.csv文件中收集数据作为ansible的变量，或者直接获取某些命令的输出作为ansible的变量，甚至从redis或者etcd这样的键值存储中取得相应的值作为ansible的变量。这个时候，我们就需要通过ansible的lookup插件来从这些数据源中读取配置数据，传递给ansbile变量，并在playbook或者模板中使用这些数据。
ansible支持一套从不同数据源获取数据的lookup，包括file, password, pipe, env, template, csvfile, dnstxt, redis_kv, etcd等
3.2 file
使用file lookup可以从文本文件中获取数据，并在这些数据传递给ansible变量，在task或者jinja2模板中进行引用。下面是一个从文本文件中获取ssh公钥并复制到远程主机的示例：
[root@node1 ansible]# vim lookup_files_ex.yml
- hosts: demo2.example.com tasks: - debug: msg: "{{ lookup('file','./hosts') }}"
[root@node1 ansible]# ansible-playbook lookup_files_ex.yml
TASK [debug] ********************************************************************************************************************************** ok: [demo2.example.com] => { "msg": "srv1.example.com\nsrv2.example.com\ns1.lab.example.com\ns2.lab.example.com\n\n[web]\njupiter.lab.example.com\nsaturn.example.com\n\n[db]\ndb1.example.com\ndb2.example.com\ndb3.example.com\n\n[lb]\nlb1.lab.example.com\nlb2.lab.example.com\n\n[boston]\ndb1.example.com\njupiter.lab.example.com\nlb2.lab.example.com\n\n[london]\ndb2.example.com\ndb3.example.com\nfile1.lab.example.com\nlb1.lab.example.com\n\n[dev]\nweb1.lab.example.com\ndb3.example.com\n\n[stage]\nfile2.example.com\ndb2.example.com\n\n[prod]\nlb2.lab.example.com\ndb1.example.com\njupiter.lab.example.com\n\n[function:children]\nweb\ndb\nlb\ncity\n\n[city:children]\nboston\nlondon\nenvironments\n\n[environments:children]\ndev\nstage\nprod\nnew\n\n[new]\n172.25.252.23\n172.25.252.44" }
可以把这个获取的值，使用set_fact变量
- hosts: demo2.example.com tasks: - set_fact: aaa={{ lookup('file','./hosts') }} - debug: msg: "{{ aaa }}"
3.3 pipe
使用pipe lookup可以直接调用外部命令，并将命令执行的结果打印到标准输出，作为ansible变量。下面的例子通过pipe调用date指令拿到一个以时间数字组成的字串，获取的是服务端命令
[root@node1 ansible]# vim lookup_pipe_ex.yml
- hosts: demo2.example.com tasks: - debug: msg: "{{ lookup('pipe','ip addr') }}"
[root@node1 ansible]# ansible-playbook lookup_pipe_ex.yml
TASK [debug] ********************************************************************************************************************************** ok: [demo2.example.com] => { "msg": "1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000\n link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00\n inet 127.0.0.1/8 scope host lo\n valid_lft forever preferred_lft forever\n inet6 ::1/128 scope host \n valid_lft forever preferred_lft forever\n2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000\n link/ether 00:0c:29:91:dd:19 brd ff:ff:ff:ff:ff:ff\n inet 192.168.132.131/24 brd 192.168.132.255 scope global noprefixroute ens33\n valid_lft forever preferred_lft forever\n inet6 fe80::bcf9:af19:a325:e2c7/64 scope link noprefixroute \n valid_lft forever preferred_lft forever\n3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default \n link/ether 02:42:00:5f:59:93 brd ff:ff:ff:ff:ff:ff\n inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0\n valid_lft forever preferred_lft forever\n inet6 fe80::42:ff:fe5f:5993/64 scope link \n valid_lft forever preferred_lft forever" }
3.4 env
env lookup实际就是获取在控制主机上的某个环境变量的值。下面是一个读取控制机上$JAVA_HOME变量值的示例：
- name: get JAVA_HOME debug: msg="{{ lookup('env', 'JAVA_HOME')}}"
3.5 csvfile
csvfile可以从.csv文件中读取一个条目。假设我们有如下示例的名为users.csv的文件：
[root@node1 ansible]# vim test.csv
username,email,gender
lorin,[email protected],female
john,[email protected],female
sue,[email protected],male
[root@node1 ansible]# vim lookup_csvf_ex.yml
- name: get sue's email hosts: demo2.example.com tasks: - debug: msg: "{{ lookup('csvfile','sue file=test.csv delimiter=, col=1')}}"
可以看到，一共向插件传递了四个参数：sue, file=test.csv, delimiter=,以及col=1。说明如下：
- 第一个参数指定一个名字，该名字必须出现在其所在行的第0列，需要说明的是，如果指定的第一个参数名字在文件中出现多次，则匹配第一次出现的结果
- 第二个参数指定csv文件的文件名
- 第三个参数指定csv文件的中条目的分隔符，
- 第四个参数指定要取得哪一列的值，这一列正是第一个参数所在行的那一列的值
[root@node1 ansible]# ansible-playbook lookup_csvf_ex.yml
TASK [debug] ********************************************************************************************************************************** ok: [demo2.example.com] => { "msg": "[email protected]" }
使用pipe，执行awk
[root@node1 ansible]# cat lookup_csvf_ex.yml
- name: get sue's email hosts: demo2.example.com tasks: - debug: msg: "{{ lookup('csvfile','sue file=test.csv delimiter=, col=1')}}" - debug: msg: lookup('pipe',"awk -F , '$1 ~/sue/ {print $2}' test.csv" )
执行
[root@node1 ansible]# ansible-playbook lookup_csvf_ex.yml
TASK [debug] ********************************************************************************************************************************** ok: [demo2.example.com] => { "msg": "[email protected]" } TASK [debug] ********************************************************************************************************************************** ok: [demo2.example.com] => { "msg": "lookup('pipe',\"awk -F , '$1 ~/sue/ {print $2}' test.csv\" )" }
3.6 redis_kv
redis_kv lookup可以直接从redis存储中来获取一个key的value，key必须是一个字符串，如同Redis GET指令一样。需要注意的是，要使用redis_kv lookup，需要在主控端安装python的redis客户端，在centos上，软件包为python-redis。
下面是一个在playbook中调用redis lookup的task，从本地的redis中取中一个key为weather的值：
- name: lookup value in redis debug: msg="{{ lookup('redis_kv', 'redis://localhost:6379,weather')}}"
其中URL部分如果不指定，该模块会默认连接到redis://localhost:6379，所以实际上在上面的实例中，调用可以直接写成如下：
{{ lookup('redis_kv', 'weather')}}
3.7 etcd
etcd是一个分布式的key-value存储，通常被用于保存配置信息或者被用于实现服务发现。可以使用etcd lookup来从etcd中获取指定key的value。
我们通过如下方法往一个etcd中写入一个key：
curl -L http://127.0.0.1:2379/v2/keys/weather -XPUT -d value=sunny
定义一个调用etcd插件的task：
- name: look up value in etcd debug: msg="{{ lookup('etcd','weather')}}"
默认情况下，etcd lookup会在http://127.0.0.1:4001上查找etcd服务器。但我们在执行playbook之前可以通过设置ANSIBLE_ETCD_URL环境变量来修改这个设置。
3.8 password
password lookup会随机生成一个密码，并将这个密码写入到参数指定的文件中。如下示例，创建一个名为bob的mysql用户，并随机生成该用户的密码，并将密码写入到主控端的bob-password.txt中：
- name: create deploy mysql user mysql_user: name=bob password={{ lookup('password', 'bob-password,txt')}} priv=*.*:ALL state=present
3.9 dnstxt
dnstxt lookup用于获取指定域名的TXT记录。需要在主控端安装python-dns。
使用方法如下：
- name: lookup TXT record debug: msg="{{ lookup('dnstxt', "aliyun.com") }}"
如果某一个主机有多个相关联的TXT记录，那么模块会把他们连在一起，并且每次调用时的连接顺序可能不同
博主声明：本文的内容来源主要来自誉天教育晏威老师，由本人实验完成操作验证，需要的博友请联系誉天教育（http://www.yutianedu.com/），获得官方同意或者晏老师（https://www.cnblogs.com/breezey/）本人同意即可转载，谢谢！