redis复制集(sentinel)

https://www.jianshu.com/p/45ffd2a84143

内核配置

cat >> /etc/rc.local << EOF

echo never > /sys/kernel/mm/transparent_hugepage/enabled
EOF

cat >> /etc/sysctl.conf << EOF
vm.overcommit_memory = 1
EOF

静态解析

cat >> /etc/hosts << EOF

10.105.225.8    redis-master
10.154.146.25   redis-slave
EOF

优化

tcp-backlog 65536
timout 300
tcp-keepalive 300
maxclients 10000
maxmemory 2G
maxmemory-policy volatile-lru

配置复制

# master /etc/redis.conf

#daemonize no
daemonize yes

#bind 127.0.0.1
bind 0.0.0.0

#protected-mode yes
protected-mode no

#dir /var/lib/redis/
dir /opt/www/redis/

masterauth @sentinel
requirepass @sentinel

# slave /etc/redis.conf

#daemonize no
daemonize yes

#bind 127.0.0.1
bind 0.0.0.0

#protected-mode yes
protected-mode no

#dir /var/lib/redis/
dir /opt/www/redis/

# 从机多了slaveof配置，注意主从要匹配
slaveof redis-master 6379
masterauth @sentinel
requirepass @sentinel

启用服务

systemctl restart redis && systemctl enable redis

systemctl restart redis-sentinel && systemctl enable redis-sentinel

查看配置状态

#redis-cli -h redis-master -a @sentinel info replication
# Replication
role:master
connected_slaves:1
slave0:ip=10.154.146.25,port=6379,state=online,offset=29,lag=1
master_repl_offset:29
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:2
repl_backlog_histlen:28

#redis-cli -h redis-slave -a @sentinel info replication
# Replication
role:slave
master_host:redis-master
master_port:6379
master_link_status:up
master_last_io_seconds_ago:1
master_sync_in_progress:0
slave_repl_offset:15
slave_priority:100
slave_read_only:1
connected_slaves:0
master_repl_offset:0
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0

配置sentinel

# 3台哨兵，2票选举

cat > /etc/redis-sentinel.conf << EOF
port 26379
protected-mode no
daemonize yes

dir /tmp
sentinel monitor mymaster redis-master 6379 2
sentinel down-after-milliseconds mymaster 2000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 5000
sentinel auth-pass mymaster @sentinel

logfile /var/log/redis/sentinel.log
EOF

cat > /etc/sentinel_26380.conf << EOF
port 26380
protected-mode no
daemonize yes

dir /tmp
sentinel monitor mymaster redis-01-master 6379 2
sentinel down-after-milliseconds mymaster 2000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 5000
sentinel auth-pass mymaster @sentinel

logfile /var/log/redis/sentinel_26380.log
EOF

cat > /etc/sentinel_26381.conf << EOF
port 26381
protected-mode no
daemonize yes

dir /tmp
sentinel monitor mymaster redis-02-master 6379 2
sentinel down-after-milliseconds mymaster 2000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 5000
sentinel auth-pass mymaster @sentinel

logfile /var/log/redis/sentinel_26381.log
EOF

cat > /etc/sentinel_26382.conf << EOF
port 26382
protected-mode no
daemonize yes

dir /tmp
sentinel monitor mymaster redis-03-master 6379 2
sentinel down-after-milliseconds mymaster 2000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 5000
sentinel auth-pass mymaster @sentinel

logfile /var/log/redis/sentinel_26382.log
EOF

# /etc/rc.local
/usr/bin/redis-sentinel /etc/sentinel_26380.conf &
/usr/bin/redis-sentinel /etc/sentinel_26381.conf &
/usr/bin/redis-sentinel /etc/sentinel_26382.conf &

sentinel状态

#redis-cli -h redis-master -p 26379 -a @sentinel info sentinel
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
master0:name=redis-01,status=ok,address=10.105.225.8:6379,slaves=1,sentinels=3

#redis-cli -h redis-slave -p 26379 -a @sentinel info sentinel
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
master2:name=redis-01,status=ok,address=10.105.225.8:6379,slaves=1,sentinels=3

sentinel切换日志

sentinel日志
[20104] 28 Mar 17:29:54.042 # +sdown master mymaster 10.105.225.8 6379
[20104] 28 Mar 17:29:54.104 # +odown master mymaster 10.105.225.8 6379 #quorum 2/2
[20104] 28 Mar 17:29:54.104 # +new-epoch 1
[20104] 28 Mar 17:29:54.104 # +try-failover master mymaster 10.105.225.8 6379
[20104] 28 Mar 17:29:54.169 # +vote-for-leader 016236a44f1376e34b8e6696c1b7eb0d8ebc3e59 1
[20104] 28 Mar 17:29:54.169 # 10.154.146.25:26379 voted for b9d0dc3e20c5c138304419a17f572e56be61a3fd 1
[20104] 28 Mar 17:29:54.169 # 10.154.43.8:26379 voted for 27c052e9e9b3ad99edc6fe85f5566157e9865309 1
[20104] 28 Mar 17:29:54.169 # 10.154.162.125:26379 voted for b9d0dc3e20c5c138304419a17f572e56be61a3fd 1
[20104] 28 Mar 17:29:54.189 # 10.154.160.30:26379 voted for b9d0dc3e20c5c138304419a17f572e56be61a3fd 1
[20104] 28 Mar 17:29:54.195 # 10.105.93.170:26379 voted for 1823e7153adb3b302a6c05e2a79ce508217e5b9f 1
[20104] 28 Mar 17:30:04.361 # -failover-abort-not-elected master redis-01 10.105.225.8 6379
[20104] 28 Mar 17:30:04.416 # Next failover delay: I will not start a failover before Wed Mar 28 17:35:54 2018
[20104] 28 Mar 17:35:54.336 # +new-epoch 2
[20104] 28 Mar 17:35:54.341 # +vote-for-leader b9d0dc3e20c5c138304419a17f572e56be61a3fd 2
[20104] 28 Mar 17:35:54.341 # Next failover delay: I will not start a failover before Wed Mar 28 17:41:54 2018
[20104] 28 Mar 17:35:54.728 # +config-update-from sentinel 10.154.162.125:26379 10.154.162.125 26379 @ redis-01 10.105.225.8 6379
[20104] 28 Mar 17:35:54.728 # +switch-master redis-01 10.105.225.8 6379 10.154.146.25 6379
[20104] 28 Mar 17:35:54.728 * +slave slave 10.105.225.8:6379 10.105.225.8 6379 @ redis-01 10.154.146.25 6379
[20104] 28 Mar 17:36:24.754 # +sdown slave 10.105.225.8:6379 10.105.225.8 6379 @ redis-01 10.154.146.25 6379