Redis 5 : Configure Replication2021/05/28 |
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Configure Redis Replication. This configuration is general Primary-Replica settings.
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| [1] | Change Settings on Primary Host. |
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[root@www ~]#
vi /etc/redis.conf # line 69 : change to own IP address or [0.0.0.0] bind 0.0.0.0
# line 136 : change (run as daemon) daemonize yes
# line 459 : add follows if need # min-replicas-to-write : if number of Replica Hosts are online, Primary Host accepts write requests # min-replicas-max-lag : decision time(sec) for online if Replica Hosts return answer within specified time
min-replicas-to-write 2
min-replicas-max-lag 10 # line 508 : authentication password
requirepass password
systemctl restart redis
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| [2] | Change Settings on Replica Host. |
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[root@node01 ~]#
vi /etc/redis.conf # line 69 : change to own IP address or [0.0.0.0] bind 0.0.0.0
# line 136 : change (run as daemon) daemonize yes
# line 287 : add Primary Host IP address and port
replicaof 10.0.0.31 6379
# line 294 : add authentication password set on Primary Host
masterauth password
# line 324 : verify parameter (set Replica Hosts read-only) replica-read-only yes systemctl restart redis
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| [3] | On all Nodes, If Firewalld is running, allow service. |
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[root@www ~]# firewall-cmd --add-service=redis --permanent success [root@www ~]# firewall-cmd --reload success |
| [4] | Verify statics on Replica Hosts, then it's OK if [master_link_status:up] is shown. |
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[root@node01 ~]# redis-cli 127.0.0.1:6379> auth password OK # show statics 127.0.0.1:6379> info Replication # Replication role:slave master_host:10.0.0.31 master_port:6379 master_link_status:up master_last_io_seconds_ago:6 master_sync_in_progress:0 slave_repl_offset:42 slave_priority:100 slave_read_only:1 connected_slaves:0 master_replid:14882ce765a9ea90fcd2db88ce8a200e344c1919 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:42 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:42 # verify to get keys set on Primary Host 127.0.0.1:6379> get key_on_master "value_on_master" |
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