（四）redis 主从同步数据
初始化一个6380的实例# cd /root/redis-2.8.13/utils/
# ./install_server.sh
Welcome to the redis service installer
This script will help you easily set up a running redis server
Please select the redis port for this instance: 6380
Please select the redis config file name
Selected default - /etc/redis/6380.conf
Please select the redis log file name
Selected default - /var/log/redis_6380.log
Please select the data directory for this instance
Selected default - /var/lib/redis/6380
Please select the redis executable path
Selected config:
Port : 6380
Config file : /etc/redis/6380.conf
Log file : /var/log/redis_6380.log
Data dir : /var/lib/redis/6380
Executable : /usr/local/bin/redis-server
Cli Executable : /usr/local/bin/redis-cli
Is this ok? Then press ENTER to go on or Ctrl-C to abort.
Copied /tmp/6380.conf => /etc/init.d/redis_6380
Installing service...
Successfully added to chkconfig!
Successfully added to runlevels 345!
Starting Redis server...
Installation successful!
同样修改配置文件
# vi /etc/redis/6380.conf
添加如下内容
slaveof 127.0.0.1 6379
# /etc/init.d/redis_6380 restart
Stopping ...
Redis stopped
Starting Redis server...
# redis-cli -p 6380 info
...
# Replication
role:slave
master_host:127.0.0.1
master_port:6379
master_link_status:up
master_last_io_seconds_ago:8
master_sync_in_progress:0
slave_repl_offset:29
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
...
# redis-cli -p 6379 info
...
# Replication
role:slave
master_host:127.0.0.1
master_port:6378
master_link_status:up
master_last_io_seconds_ago:1
master_sync_in_progress:0
slave_repl_offset:1092
slave_priority:100
slave_read_only:1
connected_slaves:1
slave0:ip=127.0.0.1,port=6380,state=online,offset=85,lag=1#在备状态下，又连接了一个备
master_repl_offset:85
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:2
repl_backlog_histlen:84
....
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