1. 使用Docker搭建redis主从复制集群
安装参照 Docker 搭建redis 集群
启动服务
docker run --name redis-master -p 6379:6379 -d redis
docker run --link redis-master:redis-master -v /data/docker/redis/redis.conf:/usr/local/etc/redis/redis.conf --name redis-slave1 -d redis redis-server /usr/local/etc/redis/redis.conf
docker run --link redis-master:redis-master -v /data/docker/redis/redis.conf:/usr/local/etc/redis/redis.conf --name redis-slave2 -d redis redis-server /usr/local/etc/redis/redis.conf
docker run --link redis-master:redis-master -v /data/docker/redis/redis.conf:/usr/local/etc/redis/redis.conf --name redis-slave3 -d redis redis-server /usr/local/etc/redis/redis.conf
本地客户端查看
D:
edis
edis-cli.exe -h xxx.xxx.xxx.xxx -p 6379
xxx.xxx.xxx.xxx:6379> info
# Replication
role:master
connected_slaves:3
slave0:ip=172.17.0.4,port=6379,state=online,offset=58278,lag=0
slave1:ip=172.17.0.5,port=6379,state=online,offset=58278,lag=0
slave2:ip=172.17.0.3,port=6379,state=online,offset=58278,lag=1
master_replid:b8a0697619cb49c9e82cdf57d404b998e7f92615
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:58278
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:58278
性能测试，10000次太慢，100并发测试
PS E:> D:
edis
edis-benchmark.exe -h xxx.xxx.xxx.xxx -p 6379 -n 100 -q
PING_INLINE: 813.01 requests per second
PING_BULK: 813.01 requests per second
SET: 840.34 requests per second
GET: 746.27 requests per second
INCR: 819.67 requests per second
LPUSH: 724.64 requests per second
RPUSH: 793.65 requests per second
LPOP: 833.33 requests per second
RPOP: 806.45 requests per second
SADD: 806.45 requests per second
SPOP: 826.45 requests per second
LPUSH (needed to benchmark LRANGE): 819.67 requests per second
LRANGE_100 (first 100 elements): 684.93 requests per second
LRANGE_300 (first 300 elements): 49.07 requests per second
LRANGE_500 (first 450 elements): 23.69 requests per second
LRANGE_600 (first 600 elements): 22.81 requests per second
MSET (10 keys): 819.67 requests per second
关掉一个从服务：
#查看所有运行容器
$ docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0ab06a9f786a redis "docker-entrypoint..." 34 minutes ago Up 34 minutes 6379/tcp redis-slave3
8bfdd1cd2e60 redis "docker-entrypoint..." 34 minutes ago Up 34 minutes 6379/tcp redis-slave2
89fc61fb4804 redis "docker-entrypoint..." 36 minutes ago Up 36 minutes 6379/tcp redis-slave1
e32817e5e65c redis "docker-entrypoint..." 40 minutes ago Up 6 minutes 0.0.0.0:6379->6379/tcp redis-master
[root@VM_128_25_centos ~]# docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0ab06a9f786a redis "docker-entrypoint..." 34 minutes ago Up 34 minutes 6379/tcp redis-slave3
8bfdd1cd2e60 redis "docker-entrypoint..." 34 minutes ago Up 34 minutes 6379/tcp redis-slave2
89fc61fb4804 redis "docker-entrypoint..." 36 minutes ago Up 36 minutes 6379/tcp redis-slave1
e32817e5e65c redis "docker-entrypoint..." 40 minutes ago Up 6 minutes 0.0.0.0:6379->6379/tcp redis-master
#停到一个从服务，可用name也可以用id
$ docker stop redis-slave3
redis-slave3
#再次查看确实停掉了
$ docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
8bfdd1cd2e60 redis "docker-entrypoint..." 35 minutes ago Up 35 minutes 6379/tcp redis-slave2
89fc61fb4804 redis "docker-entrypoint..." 37 minutes ago Up 37 minutes 6379/tcp redis-slave1
e32817e5e65c redis "docker-entrypoint..." 42 minutes ago Up 7 minutes 0.0.0.0:6379->6379/tcp redis-master
再次测试发现区别不大， docker start redis-slave3启动刚才停掉的容器。
$ docker start redis-slave3
redis-slave3
$docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0ab06a9f786a redis "docker-entrypoint..." 3 hours ago Up 1 second 6379/tcp redis-slave3
8bfdd1cd2e60 redis "docker-entrypoint..." 3 hours ago Up 3 hours 6379/tcp redis-slave2
89fc61fb4804 redis "docker-entrypoint..." 3 hours ago Up 3 hours 6379/tcp redis-slave1
e32817e5e65c redis "docker-entrypoint..." 3 hours ago Up About an hour 0.0.0.0:6379->6379/tcp redis-master
看到，又有了第三个从服务redis-slave3。
p.s. 修改了配置/data/docker/redis.conf后，可以关掉redis-master容器再开启用来生效配置。
换一台机子搭建从服务器。
2. 配置另一台服务器为从服务器
用阿里的一个闲置服务器，这里就不用docker了，玩不太懂，还是乖乖yum安装redis
2.1 安装配置redis
#安装
yum install redis
#启动
service redis start
#配置文件在
/etc/redis.conf
安装redis之后，发现客户端连接无反应，配置规则并关闭防火墙后，，提醒redis受保护模式拒绝访问，配置中 daemonize no 改为yes,再次访问发现奇怪的错误在驱动器 %1 上插入软盘，redis添加密码 requirepass 123456，解决错误。
客户端再次访问redis-cli.exe -h yyy.yyy.yyy.yyy -p 6379 -a 123456，访问成功。
可以用service redis restart重启，但是无法用service redis stop停止，可能是有密码的原因，可以进客户端然后shutdown掉
$ redis-cli -a 123456
127.0.0.1:6379> SHUTDOWN
not connected> exit
也可以直接用redis-cli -p 6380 -a 123456 shutdown删除，这里带-p是因为我改了端口，默认为6379则不用-p，如果没密码的话，那也不用-a直接redis-cli shutdown即可关闭。
2.2 配置从服务器
配置中slaveof <masterip> <masterport>改为主服务器ip
slaveof xxx.xxx.xxx.xxx 6379
试了好久无法获取到master的值，查看redis日志
37358 22528:S 03 May 18:08:23.521 * MASTER <-> SLAVE sync: Loading DB in memory
37359 22528:S 03 May 18:08:23.521 # Can't handle RDB format version 8
37360 22528:S 03 May 18:08:23.521 # Failed trying to load the MASTER synchronization DB from disk
查看两个redis版本
从服务器直接安装的redis，查看很简单
$redis-server --version
Redis server v=3.2.11 sha=00000000:0 malloc=jemalloc-3.6.0 bits=64 build=6ad59
主服务器docker下版本查看
$docker run redis redis-server --version
Redis server v=4.0.9 sha=00000000:0 malloc=jemalloc-4.0.3 bits=64 build=22c6ee
是不一样，怎么办呢，搜了几个，都是删除rdb文件，我删了也不行。再安装一次redis吧。
从服务器再次安装redis 4.0.9，安装并再次配置后客户端连接会有错误
Error: Server closed the connection，配置更改注释bind也没用，发现没有指定文件，再次启动redis
./src/redis-server /root/redis-4.0.9/redis.conf
,可以连接并可访问主服务器数据。
试验一下，xxx为主服务器IP，yyy为从服务器IP：
PS E:> D:
edis
edis-cli.exe -h xxx.xxx.xxx.xxx -p 6379
xxx.xxx.xxx.xxx:6379> set day 3
OK
PS E:> D:
edis
edis-cli.exe -h yyy.yyy.yyy.yyy -p 6379 -a 123456
yyy.yyy.yyy.yyy:6379> get day
"3"
yyy.yyy.yyy.yyy:6379> set day2 111
(error) READONLY You can't write against a read only slave.
yyy.yyy.yyy.yyy:6379>
可以看到从服务器slave不能写，只能读。
3. 性能测试
先关闭调主服务器之前建的三个slave，
$ docker stop redis-slave1
redis-slave
$ docker stop redis-slave2
redis-slave2
$ docker stop redis-slave3
redis-slave3
开始测试，
没有使用从服务器的slave时,
PS E:> D:
edis
edis-benchmark.exe -h xxx.xxx.xxx.xxx -p 6379 -n 1000 -q
PING_INLINE: 1204.82 requests per second
PING_BULK: 1191.90 requests per second
SET: 1219.51 requests per second
GET: 1213.59 requests per second
INCR: 1209.19 requests per second
LPUSH: 1210.65 requests per second
RPUSH: 1183.43 requests per second
LPOP: 1197.60 requests per second
RPOP: 1222.49 requests per second
SADD: 1144.16 requests per second
SPOP: 1210.65 requests per second
LPUSH (needed to benchmark LRANGE): 1215.07 requests per second
LRANGE_100 (first 100 elements): 102.64 requests per second
LRANGE_300 (first 300 elements): 29.06 requests per second
LRANGE_500 (first 450 elements): 25.27 requests per second
LRANGE_600 (first 600 elements): 15.88 requests per second
MSET (10 keys): 1201.92 requests per second
启动从服务器,使用从服务器slave
PS E:> D:
edis
edis-benchmark.exe -h xxx.xxx.xxx.xxx -p 6379 -n 1000 -q
PING_INLINE: 1184.83 requests per second
PING_BULK: 1207.73 requests per second
SET: 1203.37 requests per second
GET: 1156.07 requests per second
INCR: 1184.83 requests per second
LPUSH: 1203.37 requests per second
RPUSH: 1201.92 requests per second
LPOP: 1223.99 requests per second
RPOP: 1200.48 requests per second
SADD: 1179.25 requests per second
SPOP: 1132.50 requests per second
LPUSH (needed to benchmark LRANGE): 1190.48 requests per second
LRANGE_100 (first 100 elements): 103.00 requests per second
LRANGE_300 (first 300 elements): 30.63 requests per second
LRANGE_500 (first 450 elements): 26.52 requests per second
LRANGE_600 (first 600 elements): 14.22 requests per second
MSET (10 keys): 1233.05 requests per second
查看主服务器信息
info
# Replication
role:master
connected_slaves:1
slave0:ip=yyy.yyy.yyy.yyy,port=6379,state=online,offset=814862,lag=1
master_replid:600f93df98b7eff6799a0e0cdb6c6d85fd401793
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:814862
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:814862
看到slave0就是从服务器的slave，可是性能怎么没有提升么，读也没有提升多少啊，可能是我测试的姿势不对？还是服务器太渣。以后再深究吧。
感谢你阅读到了这里，这篇笔记太凌乱又因鄙人不才，本不成文章，可是放到私人笔记里也帮助不到任何人（包括自己），请多多批评。