一、前提，请认真阅读我上篇博文《consul 1.0 server cluster集群配置全解密》
http://412166174.blog.51cto.com/3102369/1975822
本文是上面文章的续集
安装consul client
consul 客户端检脚本
=============================================================================================
在192.168.56.122服务器上
=============================================================================================
1、安装redis
yum intstall redis -y
2、配置redis 为主
cat >/etc/redis.conf<<EOF
bind 192.168.56.122 127.0.0.1
protected-mode yes
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize yes
supervised no
pidfile /var/run/redis_6379.pid
loglevel notice
logfile /var/log/redis/redis.log
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir /var/lib/redis
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
requirepass password
appendonly no
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes
EOF
3、启动redis
service redis start
4、配置consul服务
[root@MySQL-slave /etc/consul]# cat >redis-master.json<<EOF
{
"service": [
{
"name": "6379-redis-m",
"tags": ["master"],
"address": "192.168.56.132",
"port": 6379,
"checks": [
{
"args": ["/data/consul/check_master.sh","0"],
"interval": "5s"
}
]
}
]
}
EOF
[root@MySQL-slave /etc/consul]# cat >redis-slave.json<<EOF
{
"service": [
{
"name": "6379-redis-s",
"tags": ["slave"],
"address": "192.168.56.132",
"port": 6379,
"checks": [
{
"args": ["/data/consul/check_slave.sh","0"],
"interval": "5s"
}
]
}
]
}
EOF
5、主从检测脚本
[root@tomcat103 17:30:04 consul]/#cat >/data/consul/check_master.sh<<EOF
#!/bin/bash
/usr/bin/redis-cli -h 127.0.0.1 -p 6379 -a password info | grep role:master
a=$?
if [ $a == 1 ];then
exit 2
fi
EOF
[root@tomcat103 17:30:18 consul]/#cat >/data/consul/check_slave.sh<<EOF
#!/bin/bash
/usr/bin/redis-cli -h 127.0.0.1 -p 6379 -a password info | grep role:slave
a=$?
if [ $a == 1 ];then
exit 2
fi
EOF
更改启动命令
nohup /usr/local/bin/consul agent -config-dir=/etc/consul -rejoin -enable-script-checks=true &
====================================================================
在192.168.56.122服务器上
====================================================================
1、安装redis
yum intstall redis -y
2、配置192.168.56.132上为192.168.56.122 redis的从
cat >/etc/redis.conf<<EOF
bind 192.168.56.132 127.0.0.1
protected-mode yes
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize yes
supervised no
pidfile /var/run/redis_6379.pid
loglevel notice
logfile /var/log/redis/redis.log
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir /var/lib/redis
slaveof 192.168.56.122 6379
masterauth password
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
requirepass password
appendonly no
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes
EOF
3、配置consul服务
主从检测脚本
[root@tomcat103 17:30:04 consul]/#cat >/data/consul/check_master.sh<<EOF
#!/bin/bash
/usr/bin/redis-cli -h 127.0.0.1 -p 6379 -a password info | grep role:master
a=$?
if [ $a == 1 ];then
exit 2
fi
EOF
[root@tomcat103 17:30:18 consul]/#cat >/data/consul/check_slave.sh<<EOF
#!/bin/bash
/usr/bin/redis-cli -h 127.0.0.1 -p 6379 -a password info | grep role:slave
a=$?
if [ $a == 1 ];then
exit 2
fi
EOF
4、consul配置文件
[root@MySQL-slave /etc/consul]# cat >/etc/consul/consul_config.json<<EOF
{
"advertise_addr": "192.168.56.132",
"bind_addr": "192.168.56.132",
"domain": "consul",
"datacenter": "consul-cluster",
"data_dir": "/data/consul/data",
"enable_syslog": true,
"performance": {
"raft_multiplier": 1
},
"dns_config": {
"allow_stale": true,
"max_stale": "15s"
},
"retry_join": [
"192.168.56.120",
"192.168.56.121",
"192.168.56.122"
],
"retry_interval": "10s",
"skip_leave_on_interrupt": true,
"leave_on_terminate": false,
"ports": {
"dns": 53,
"http": 80
},
"rejoin_after_leave": true,
"addresses": {
"http": "0.0.0.0",
"dns": "0.0.0.0"
}
}
EOF
[root@MySQL-slave /etc/consul]# cat >/etc/consul/redis-master.json<<EOF
{
"service": [
{
"name": "6379-redis-m",
"tags": ["master"],
"address": "192.168.56.132",
"port": 6379,
"checks": [
{
"args": ["/data/consul/check_master.sh","0"],
"interval": "5s"
}
]
}
]
}
EOF
[root@MySQL-slave /etc/consul]# cat >/etc/consul/redis-slave.json<<EOF
{
"service": [
{
"name": "6379-redis-s",
"tags": ["slave"],
"address": "192.168.56.132",
"port": 6379,
"checks": [
{
"args": ["/data/consul/check_slave.sh","0"],
"interval": "5s"
}
]
}
]
}
EOF
5、启动consul客户端服务
nohup consul agent -config-dir /etc/consul/ -data-dir /data/consul/data -enable-script-checks=true -ui &
6、 在122服务器上ping 域名
测试高可用性
ping 6379-redis-m.service.consul
ping 6379-redis-s.service.consul
（推荐使用dig @192.168.56.120 -p 53 6379-redis-m.service.consul 命令测试 ）
================================================================================== 更改两个服务器redis配置 互换主从角色 在122上打开着两行注释 slaveof 192.168.56.132 6379 masterauth password 重启redis service redis restart 在132上 #slaveof 192.168.56.122 6379 #masterauth password 重启服务 service redis restart 重新测试域名对应的数据库主从地址 ping 6379-redis-m.service.consul ping 6379-redis-s.service.consul
至此consul通过脚本自动发现redis主从高可用完成
特别建议使用sentinel 或者redis cluster 实现故障切换，本文利用主从结构只是为了达到实验目的
