Redis master-slave Construction

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Jenner

1

For details about how to install apsaradb for redis, refer:

[[email protected] redis]# redis-server --versionRedis server v=2.8.7 sha=00000000:0 malloc=jemalloc-3.2.0 bits=32 build=df8b796b6fcf0127[[email protected] redis]# cat /proc/versionLinux version 2.6.18-92.el5 ([email protected]) (gcc version 4.1.2 20071124 (Red Hat 4.1.2-42)) #1 SMP Tue Jun 10 18:49:47 EDT 2008

1. Copy the configuration file

# Master configuration file CP redis. conf redis-master.conf # slave configuration file CP redis. conf redis-slave.conf # backup configuration file CP redis. conf redis-bak.conf

2. modify the configuration file

# Master configuration file # ensure differentiation of PID files, PID file is mainly used to ensure that the daemon Single Instance run pidfile/var/run/redis-master.pid # distinguish Log File logfile "/data/redis/6379/log/redis. log "# differentiate persistent files DIR/data/redis/6379/data # differentiate Port port 6379 # slave configuration file pidfile/var/run/redis-slave.pidlogfile"/data/redis/6380/log /redis. log "DIR/data/redis/6380/dataport 6380 slaveof 127.0.0.1 6379 # If yes, the slave instance is read-only. If no, the slave instance can be read and written. Default slave-read-only yes

3. Start

redis-server /etc/redis/redis-master.confredis-server /etc/redis/redis-slave.conf

4. Verify the master startup log

[[email protected] redis]# cat /data/redis/6379/log/redis.log[24787] 13 Sep 10:39:45.143 * Max number of open files set to 10032[24787] 13 Sep 10:39:45.145 # Warning: 32 bit instance detected but no memory limit set. Setting 3 GB maxmemory limit with ‘noeviction‘ policy now._.__.-``__ ‘‘-.__.-``    `.  `_.  ‘‘-._           Redis 2.8.7 (00000000/0) 32 bit.-`` .-```.  ```\/    _.,_ ‘‘-._(    ‘      ,       .-`  | `,    )     Running in stand alone mode|`-._`-...-` __...-.``-._|‘` _.-‘|     Port: 6379|    `-._   `._    /     _.-‘    |     PID: 24787`-._    `-._  `-./  _.-‘    _.-‘|`-._`-._    `-.__.-‘    _.-‘_.-‘||    `-._`-._        _.-‘_.-‘    |           http://redis.io`-._    `-._`-.__.-‘_.-‘    _.-‘|`-._`-._    `-.__.-‘    _.-‘_.-‘||    `-._`-._        _.-‘_.-‘    |`-._    `-._`-.__.-‘_.-‘    _.-‘`-._    `-.__.-‘    _.-‘`-._        _.-‘`-.__.-‘[24787] 13 Sep 10:39:45.146 # Server started, Redis version 2.8.7[24787] 13 Sep 10:39:45.146 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add ‘vm.overcommit_memory = 1‘ to /etc/sysctl.conf and then reboot or run the command ‘sysctl vm.overcommit_memory=1‘ for this to take effect.[24787] 13 Sep 10:39:45.146 * The server is now ready to accept connections on port 6379[24787] 13 Sep 10:40:54.342 * DB saved on disk[24787] 13 Sep 10:42:50.581 * Slave asks for synchronization[24787] 13 Sep 10:42:50.581 * Full resync requested by slave.[24787] 13 Sep 10:42:50.581 * Starting BGSAVE for SYNC[24787] 13 Sep 10:42:50.582 * Background saving started by pid 24816[24816] 13 Sep 10:42:50.586 * DB saved on disk[24816] 13 Sep 10:42:50.587 * RDB: 0 MB of memory used by copy-on-write[24787] 13 Sep 10:42:50.673 * Background saving terminated with success[24787] 13 Sep 10:42:50.673 * Synchronization with slave succeeded[24787] 13 Sep 10:47:04.093 * DB saved on disk

Slave startup log

[[email protected] redis]# cat /data/redis/6380/log/redis.log[24813] 13 Sep 10:42:50.578 * Max number of open files set to 10032[24813] 13 Sep 10:42:50.579 # Warning: 32 bit instance detected but no memory limit set. Setting 3 GB maxmemory limit with ‘noeviction‘ policy now._.__.-``__ ‘‘-.__.-``    `.  `_.  ‘‘-._           Redis 2.8.7 (00000000/0) 32 bit.-`` .-```.  ```\/    _.,_ ‘‘-._(    ‘      ,       .-`  | `,    )     Running in stand alone mode|`-._`-...-` __...-.``-._|‘` _.-‘|     Port: 6380|    `-._   `._    /     _.-‘    |     PID: 24813`-._    `-._  `-./  _.-‘    _.-‘|`-._`-._    `-.__.-‘    _.-‘_.-‘||    `-._`-._        _.-‘_.-‘    |           http://redis.io`-._    `-._`-.__.-‘_.-‘    _.-‘|`-._`-._    `-.__.-‘    _.-‘_.-‘||    `-._`-._        _.-‘_.-‘    |`-._    `-._`-.__.-‘_.-‘    _.-‘`-._    `-.__.-‘    _.-‘`-._        _.-‘`-.__.-‘[24813] 13 Sep 10:42:50.580 # Server started, Redis version 2.8.7[24813] 13 Sep 10:42:50.580 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add ‘vm.overcommit_memory = 1‘ to /etc/sysctl.conf and then reboot or run the command ‘sysctl vm.overcommit_memory=1‘ for this to take effect.[24813] 13 Sep 10:42:50.580 * The server is now ready to accept connections on port 6380[24813] 13 Sep 10:42:50.580 * Connecting to MASTER 127.0.0.1:6379[24813] 13 Sep 10:42:50.580 * MASTER <-> SLAVE sync started[24813] 13 Sep 10:42:50.580 * Non blocking connect for SYNC fired the event.[24813] 13 Sep 10:42:50.581 * Master replied to PING, replication can continue...[24813] 13 Sep 10:42:50.581 * Partial resynchronization not possible (no cached master)[24813] 13 Sep 10:42:50.583 * Full resync from master: 9ef3d846e366f7643db9e9250b508d64a34c1079:1[24813] 13 Sep 10:42:50.673 * MASTER <-> SLAVE sync: receiving 31 bytes from master[24813] 13 Sep 10:42:50.673 * MASTER <-> SLAVE sync: Flushing old data[24813] 13 Sep 10:42:50.673 * MASTER <-> SLAVE sync: Loading DB in memory[24813] 13 Sep 10:42:50.674 * MASTER <-> SLAVE sync: Finished with success[24813] 13 Sep 10:47:04.096 * DB saved on disk

Data Synchronization Verification:

[[email protected] redis]# redis-cli127.0.0.1:6379> set name testOK127.0.0.1:6379> saveOK[[email protected] redis]# redis-cli -p 6380127.0.0.1:6380> keys *1) "name"

Redis master-slave Construction