Linux优化配置
优化/etc/sysctl.conf文件
net.ipv4.ip_forward= 0
kernel.sysrq = 0
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
vm.overcommit_memory = 1
net.ipv4.tcp_max_syn_backlog = 1638400
net.core.somaxconn = 1638400
net.core.netdev_max_backlog = 20000
net.ipv4.tcp_max_tw_buckets = 1800000
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_keepalive_time = 90
net.ipv4.ip_local_port_range = 1024 65000
net.ipv4.tcp_window_scaling = 1
net.ipv4.icmp_echo_ignore_all = 0
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.tcp_sack = 0
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_intvl = 30
net.ipv4.tcp_retries2 = 5
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_reordering = 5
net.ipv4.tcp_retrans_collapse = 0
net.ipv4.tcp_wmem = 51200 131072 4194304
net.ipv4.tcp_rmem = 51200 131072 4194304
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.netfilter.nf_conntrack_max = 655350
net.netfilter.nf_conntrack_tcp_timeout_established = 90
net.netfilter.nf_conntrack_tcp_timeout_close_wait = 30
net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 60
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 60
优化/etc/security/limits.conf文件
echo "* soft nproc 65535" >> /etc/security/limits.conf
echo "* hard nproc 65535" >> /etc/security/limits.conf
Mycat优化配置
JVM参数优化
JVM参数都是在Mycat的安装目录下的conf目录中的wrapper.conf文件中配置的。例如下面的配置
wrapper.java.additional.5=-XX:MaxDirectMemorySize=4G
对于Mycat独立服务器而言，可以将其占用的内存设置为系统内存的一半或者三分之二。
server.xml系统参数优化
上述优化项都是在server.xml文件的system标签下配置。
log4j2.xml日志级别优化
通常优化下面的配置项，一般将log日志的级别设置为info即可。
<asyncRoot level="info" includeLocation="true">
MySQL优化
通过my.cnf优化MySQL配置
例如，下面的配置为MySQL 8.x版本的my.cnf配置文件。
[client]
port = 3306
socket = /data/mysql/run/mysql.sock
default-character-set = utf8mb4
# The MySQL server
[mysqld]
port = 3306
user = mysql
socket = /data/mysql/run/mysql.sock
pid_file = /data/mysql/run/mysqld.pid
basedir = /usr/local/mysql
datadir = /data/mysql/data
tmpdir = /data/mysql/tmp
open_files_limit = 65535
explicit_defaults_for_timestamp
server_id = 1
lower_case_table_names = 1
character_set_server = utf8mb4
safe_user_create
max_connections = 3000
max_user_connections=2980
secure_file_priv=/data/mysql/tmp
max_connect_errors = 100000
interactive_timeout = 86400
wait_timeout = 86400
sync_binlog=100
back_log=1024
max_binlog_cache_size=2147483648
max_binlog_size=524288000
default_storage_engine = InnoDB
log_slave_updates = 1
#*********** Logs related settings ***********
log_bin = /data/mysql/log/bin_log/mysql-bin
binlog_format= mixed
binlog_cache_size=32m
max_binlog_cache_size=64m
max_binlog_size=512m
long_query_time = 1
log_output = FILE
log_error = /data/mysql/log/error_log/mysql-error.log
slow_query_log = 1
slow_query_log_file = /data/mysql/log/query_log/slow_statement.log
log_queries_not_using_indexes=0
log_slave_updates=ON
log_slow_admin_statements=1
general_log = 0
general_log_file = /data/mysql/log/general_log/general_statement.log
binlog_expire_logs_seconds = 1728000
relay_log = /data/mysql/log/bin_log/relay-bin
relay_log_index = /data/mysql/log/bin_log/relay-bin.index
#****** MySQL Replication New Feature*********
master_info_repository=TABLE
relay-log-info-repository=TABLE
relay-log-recovery
#*********** INNODB Specific options ***********
innodb_buffer_pool_size = 4096M
transaction_isolation=REPEATABLE-READ
innodb_buffer_pool_instances = 8
innodb_file_per_table = 1
innodb_data_home_dir = /data/mysql/log/innodb_ts
innodb_data_file_path = ibdata1:2048M:autoextend
innodb_thread_concurrency = 8
innodb_log_buffer_size = 67108864
innodb_log_file_size = 1048576000
innodb_log_files_in_group = 4
innodb_max_undo_log_size=4G
innodb_undo_directory=/data/mysql/log/undo_space/
innodb_log_group_home_dir = /data/mysql/log/innodb_log/
innodb_adaptive_flushing=ON
innodb_flush_log_at_trx_commit = 2
innodb_max_dirty_pages_pct = 60
innodb_open_files=60000
innodb_purge_threads=1
innodb_read_io_threads=4
innodb_stats_on_metadata=OFF
innodb_flush_method=O_DIRECT
[mysql]
no-auto-rehash
default-character-set=utf8mb4
net-buffer-length=64K
unbuffered
max-allowed-packet = 2G
default-character-set = utf8mb4
#some var for mysql8
#log_error_verbosity=3
#innodb_print_ddl_logs=1
#binlog_expire_logs_seconds=259200
#innodb_dedicate_server=0
#
#innodb_status_file=1
#innodb_status_output=0
#innodb_status_output_locks=0
[mysqldump]
quick
max_allowed_packet=2G
log_error=/data/mysql/log/error_log/mysql_dump_error.log
net_buffer_length=8k
关于MySQL 5.6和MySQL 5.7以及MySQL 8.x版本的完整my.cnf文件，大家可以到链接https://download.csdn.net/download/l1028386804/12099311进行下载。
