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Redis : Replication Setting
2016/07/21 |
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Configure Redis Replication. This configuration is general Master-Slave settings.
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| [1] | Change Settings on Master Host. |
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[root@dlp ~]#
vi /etc/redis.conf # line 64: change to own IP or 0.0.0.0 bind 0.0.0.0
# line 377: add follows if you need # min-slaves-to-write : if number of slave Hosts are online, Master Host accepts write requests # min-slaves-max-lag : decision time(sec) for online if Slave Hosts return answer within specified time
min-slaves-to-write 2
min-slaves-max-lag 10 systemctl restart redis
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| [2] | Cahnge Settings on Slave Hosts. |
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[root@node01 ~]#
vi /etc/redis.conf # line 64: change to own IP or 0.0.0.0 bind 0.0.0.0
# line 206: add Master server's IP and port
slaveof 10.0.0.30 6379
# line 213: add connection password set on Master Host
masterauth password
# line 241: verify parameter (set Slave Hosts read-only) slave-read-only yes systemctl restart redis
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| [3] | If Firewalld is running on Master/Slave Hosts, allow Redis port. |
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[root@dlp ~]# firewall-cmd --add-port=6379/tcp --permanent success [root@dlp ~]# firewall-cmd --reload success |
| [4] | If SELinux is enabled on Slave Hosts, add rules for replication like follows. |
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[root@node01 ~]#
vi redis_repl.te # create new
module redis_repl 1.0;
require {
type redis_port_t;
type redis_t;
class tcp_socket name_connect;
}
#============= redis_t ==============
allow redis_t redis_port_t:tcp_socket name_connect;
checkmodule -m -M -o redis_repl.mod redis_repl.te checkmodule: loading policy configuration from redis_repl.te checkmodule: policy configuration loaded checkmodule: writing binary representation (version 17) to redis_repl.mod [root@node01 ~]# semodule_package --outfile redis_repl.pp --module redis_repl.mod [root@node01 ~]# semodule -i redis_repl.pp |
| [5] | Verify statics on Slave Hosts, then it's OK if "master_link_status:up" is shown. |
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[root@node01 ~]# redis-cli info Replication # Replication role:slave master_host:10.0.0.30 master_port:6379 master_link_status:up master_last_io_seconds_ago:1 master_sync_in_progress:0 slave_repl_offset:384 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 # try to get a Key normally [root@node01 ~]# redis-cli get key_on_master "value_on_master" |