【Docker初探】第六节：Docker Swarm集群，及Windows下部署

相关资料：

在Windows下，使用Docker Swarm的前期配置（Linux下无需该步骤）：

1.右键点击docker图标，进入 Settings => Daemon ，开启advance，把json 里面的experimental设置为true，保存重启Docker。解决无法拉取镜像问题。

2.右键点击docker图标，点击 Switch to Windows containers... 切换到Windows容器模式。Windows系统必须要在该模式才能正常开启Swarm：

Docker集群适合部署web服务，同时运行多个web服务，再通过Nginx做负载均衡，以满足高并发需求。每个节点内存独立，不共享。

Docker集群由多个Manager节点和多个Worker节点组成。Manager节点负载动态分配Task到Worker节点，维护管理集群。Worker节点负责完成Task。

Docker集群最少由一个Manager节点和两个Worker节点组成。

下面开始建立Docker集群。

建立管理节点：

docker swarm init --advertise-addr <MANAGER-IP>

查看新增worker节点命令：

docker swarm join-token worker

查看新增manager节点命令：

docker swarm join-token manager

可以先加两个Worker节点，查看新增worker节点命令，命令类似如下：

docker swarm join --token SWMTKN-1-49nj1cmql0jkz5s954yi3oex3nedyz0fb0xx14ie39trti4wxv-8vxv8rssmk743ojnwacrr2e7c 192.168.99.100:2377

查看当前节点：

docker node ls

到这，集群以建立，下面开始部署服务。

修改第一节的文件，Dockerfile文件，内容如下：

# 基于alpine的镜像
FROM alpine:3.9
MAINTAINER Docker PPHT <[email protected]>

#复制文件
COPY start.sh /root/start.sh
COPY supervisor.d/ /etc/supervisor.d

RUN echo "http://mirrors.ustc.edu.cn/alpine/v3.9/main/" > /etc/apk/repositories \
	&& apk update \
	&& apk upgrade \
	&& apk add --no-cache bash bash-doc bash-completion \
	&& apk add --no-cache openssh-server openssh-sftp-server tzdata openrc supervisor \
	&& cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \
	&& sed -i 's/#Port 22/Port 22/g' /etc/ssh/sshd_config \
	&& sed -i 's/#ListenAddress 0.0.0.0/ListenAddress 0.0.0.0/g' /etc/ssh/sshd_config \
	&& sed -i 's/#ListenAddress ::/ListenAddress ::/g' /etc/ssh/sshd_config \
	&& sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/g' /etc/ssh/sshd_config \
	&& sed -i 's/#PasswordAuthentication yes/PasswordAuthentication yes/g' /etc/ssh/sshd_config \
	&& ssh-keygen -A \
	&& echo "root:123456" | chpasswd \
	&& chmod 777 /root/start.sh \
	&& rm -rf /var/cache/apk/*

# 开端口
EXPOSE 22
EXPOSE 9001

COPY supervisord.conf /etc/supervisord.conf

CMD "sh /root/start.sh"

start.sh文件，内容如下：

#!/bin/bash
/usr/bin/supervisord -c /etc/supervisord.conf

supervisord.conf文件，内容如下：

; Sample supervisor config file.

[unix_http_server]
file=/run/supervisord.sock   ; (the path to the socket file)
;chmod=0700                  ; socked file mode (default 0700)
;chown=nobody:nogroup        ; socket file uid:gid owner
;username=user               ; (default is no username (open server))
;password=123                ; (default is no password (open server))

[inet_http_server]          ; inet (TCP) server disabled by default
port=127.0.0.1:9001         ; (ip_address:port specifier, *:port for all iface)
username=admin               ; (default is no username (open server))
password=123456                ; (default is no password (open server))

[supervisord]
logfile=/var/log/supervisord.log ; (main log file;default $CWD/supervisord.log)
;logfile_maxbytes=50MB       ; (max main logfile bytes b4 rotation;default 50MB)
;logfile_backups=10          ; (num of main logfile rotation backups;default 10)
loglevel=info                ; (log level;default info; others: debug,warn,trace)
pidfile=/run/supervisord.pid ; (supervisord pidfile;default supervisord.pid)
nodaemon=true              ; (start in foreground if true;default false)
;minfds=1024                 ; (min. avail startup file descriptors;default 1024)
;minprocs=200                ; (min. avail process descriptors;default 200)
;umask=022                   ; (process file creation umask;default 022)
;user=chrism                 ; (default is current user, required if root)
;identifier=supervisor       ; (supervisord identifier, default is 'supervisor')
;directory=/tmp              ; (default is not to cd during start)
;nocleanup=true              ; (don't clean up tempfiles at start;default false)
;childlogdir=/var/log/supervisor ; ('AUTO' child log dir, default $TEMP)
;environment=KEY=value       ; (key value pairs to add to environment)
;strip_ansi=false            ; (strip ansi escape codes in logs; def. false)

; the below section must remain in the config file for RPC
; (supervisorctl/web interface) to work, additional interfaces may be
; added by defining them in separate rpcinterface: sections
[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface

[supervisorctl]
serverurl=unix:///run/supervisord.sock ; use a unix:// URL  for a unix socket
;serverurl=http://127.0.0.1:9001 ; use an http:// url to specify an inet socket
;username=chris              ; should be same as http_username if set
;password=123                ; should be same as http_password if set
;prompt=mysupervisor         ; cmd line prompt (default "supervisor")
;history_file=~/.sc_history  ; use readline history if available

; The below sample program section shows all possible program subsection values,
; create one or more 'real' program: sections to be able to control them under
; supervisor.

;[program:theprogramname]
;command=/bin/cat              ; the program (relative uses PATH, can take args)
;process_name=%(program_name)s ; process_name expr (default %(program_name)s)
;numprocs=1                    ; number of processes copies to start (def 1)
;directory=/tmp                ; directory to cwd to before exec (def no cwd)
;umask=022                     ; umask for process (default None)
;priority=999                  ; the relative start priority (default 999)
;autostart=true                ; start at supervisord start (default: true)
;autorestart=unexpected        ; whether/when to restart (default: unexpected)
;startsecs=1                   ; number of secs prog must stay running (def. 1)
;startretries=3                ; max # of serial start failures (default 3)
;exitcodes=0,2                 ; 'expected' exit codes for process (default 0,2)
;stopsignal=QUIT               ; signal used to kill process (default TERM)
;stopwaitsecs=10               ; max num secs to wait b4 SIGKILL (default 10)
;killasgroup=false             ; SIGKILL the UNIX process group (def false)
;user=chrism                   ; setuid to this UNIX account to run the program
;redirect_stderr=true          ; redirect proc stderr to stdout (default false)
;stdout_logfile=/a/path        ; stdout log path, NONE for none; default AUTO
;stdout_logfile_maxbytes=1MB   ; max # logfile bytes b4 rotation (default 50MB)
;stdout_logfile_backups=10     ; # of stdout logfile backups (default 10)
;stdout_capture_maxbytes=1MB   ; number of bytes in 'capturemode' (default 0)
;stdout_events_enabled=false   ; emit events on stdout writes (default false)
;stderr_logfile=/a/path        ; stderr log path, NONE for none; default AUTO
;stderr_logfile_maxbytes=1MB   ; max # logfile bytes b4 rotation (default 50MB)
;stderr_logfile_backups=10     ; # of stderr logfile backups (default 10)
;stderr_capture_maxbytes=1MB   ; number of bytes in 'capturemode' (default 0)
;stderr_events_enabled=false   ; emit events on stderr writes (default false)
;environment=A=1,B=2           ; process environment additions (def no adds)
;serverurl=AUTO                ; override serverurl computation (childutils)

; The below sample eventlistener section shows all possible
; eventlistener subsection values, create one or more 'real'
; eventlistener: sections to be able to handle event notifications
; sent by supervisor.

;[eventlistener:theeventlistenername]
;command=/bin/eventlistener    ; the program (relative uses PATH, can take args)
;process_name=%(program_name)s ; process_name expr (default %(program_name)s)
;numprocs=1                    ; number of processes copies to start (def 1)
;events=EVENT                  ; event notif. types to subscribe to (req'd)
;buffer_size=10                ; event buffer queue size (default 10)
;directory=/tmp                ; directory to cwd to before exec (def no cwd)
;umask=022                     ; umask for process (default None)
;priority=-1                   ; the relative start priority (default -1)
;autostart=true                ; start at supervisord start (default: true)
;autorestart=unexpected        ; whether/when to restart (default: unexpected)
;startsecs=1                   ; number of secs prog must stay running (def. 1)
;startretries=3                ; max # of serial start failures (default 3)
;exitcodes=0,2                 ; 'expected' exit codes for process (default 0,2)
;stopsignal=QUIT               ; signal used to kill process (default TERM)
;stopwaitsecs=10               ; max num secs to wait b4 SIGKILL (default 10)
;killasgroup=false             ; SIGKILL the UNIX process group (def false)
;user=chrism                   ; setuid to this UNIX account to run the program
;redirect_stderr=true          ; redirect proc stderr to stdout (default false)
;stdout_logfile=/a/path        ; stdout log path, NONE for none; default AUTO
;stdout_logfile_maxbytes=1MB   ; max # logfile bytes b4 rotation (default 50MB)
;stdout_logfile_backups=10     ; # of stdout logfile backups (default 10)
;stdout_events_enabled=false   ; emit events on stdout writes (default false)
;stderr_logfile=/a/path        ; stderr log path, NONE for none; default AUTO
;stderr_logfile_maxbytes=1MB   ; max # logfile bytes b4 rotation (default 50MB)
;stderr_logfile_backups        ; # of stderr logfile backups (default 10)
;stderr_events_enabled=false   ; emit events on stderr writes (default false)
;environment=A=1,B=2           ; process environment additions
;serverurl=AUTO                ; override serverurl computation (childutils)

; The below sample group section shows all possible group values,
; create one or more 'real' group: sections to create "heterogeneous"
; process groups.

;[group:thegroupname]
;programs=progname1,progname2  ; each refers to 'x' in [program:x] definitions
;priority=999                  ; the relative start priority (default 999)

; The [include] section can just contain the "files" setting.  This
; setting can list multiple files (separated by whitespace or
; newlines).  It can also contain wildcards.  The filenames are
; interpreted as relative to this file.  Included files *cannot*
; include files themselves.

[include]
files = /etc/supervisor.d/*.ini

在命令行切换到根目录，执行下面命令，建立docker镜像：

docker build -t highlevel/alpine-server:base-swarm .

如果要建立glibc镜像，把第二节Dockerfile文件，改成如下内容：

# 基于highlevel/alpine-server:base-swarm镜像
FROM highlevel/alpine-server:base-swarm
MAINTAINER Docker PPHT <[email protected]>

#复制文件
COPY glibc-2.29-r0.apk /root/glibc-2.29-r0.apk
COPY glibc-bin-2.29-r0.apk /root/glibc-bin-2.29-r0.apk
COPY glibc-i18n-2.29-r0.apk /root/glibc-i18n-2.29-r0.apk

RUN apk --no-cache add ca-certificates wget \
    && wget -q -O /etc/apk/keys/sgerrand.rsa.pub https://alpine-pkgs.sgerrand.com/sgerrand.rsa.pub \
    && apk add /root/glibc-2.29-r0.apk /root/glibc-bin-2.29-r0.apk /root/glibc-i18n-2.29-r0.apk \
    && rm -rf /var/cache/apk/* /root/glibc-2.29-r0.apk /root/glibc-bin-2.29-r0.apk /root/glibc-i18n-2.29-r0.apk


# 配置Java环境变量,这里请对应jdk路径
ENV JAVA_HOME=/root/jdk1.8.0_211
ENV CLASSPATH=$JAVA_HOME/bin
ENV PATH=.:$JAVA_HOME/bin:$PATH

# 开端口
EXPOSE 22
EXPOSE 9001

CMD "sh /root/start.sh"

在命令行切换到根目录，执行下面命令，建立docker镜像：

docker build -t highlevel/alpine-server:glibc-swarm .

创建服务，可通过--replicas 3，设置服务启动数量：

#基于highlevel/alpine-server:base-swarm
docker service create --name alpine-base-swarm --publish 10022:22 --publish 9001:9001 highlevel/alpine-server:base-swarm sh /root/start.sh

#基于highlevel/alpine-server:glibc-swarm
docker service create --name alpine-base-swarm --publish 10022:22 --publish 9001:9001 highlevel/alpine-server:glibc-swarm sh /root/start.sh

查看服务运行状态，删除服务命令：

#查看服务列表
docker service ls

#查看服务进程
docker service ps alpine-base-swarm

#查看服务日志
docker service logs alpine-base-swarm

#查看服务配置明细
docker service inspect alpine-base-swarm

#删除服务
docker service rm alpine-base-swarm

PPHT-H

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【Docker初探】第六节：Docker Swarm集群，及Windows下部署

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