Valkey : Configure Replication2024/11/15

	Configure Valkey Replication. This configuration is general Primary-Replica settings.
[1]	Change Settings on Primary Host.

[root@dlp ~]#

vi /etc/valkey/valkey.conf

# line 89 : change to own IP address or [0.0.0.0]

bind

0.0.0.0 -::

# line 308 : change (run as daemon)

daemonize

yes

# line 834 : 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 1
min-replicas-max-lag 10

# line 1082 : authentication password

requirepass password

[root@dlp ~]#

systemctl restart valkey

[2]	Change Settings on Replica Host.

[root@node01 ~]#

vi /etc/valkey/valkey.conf

# line 88 : change to own IP address or [0.0.0.0]

bind

0.0.0.0 -::

# line 308 : change (run as daemon)

daemonize

yes

# line 553 : add Primary Host IP address and port

replicaof 10.0.0.30 6379

# line 571 : add authentication password set on Primary Host

primaryauth password

# line 602 : verify parameter (set Replica Hosts read-only)

replica-read-only yes

[root@node01 ~]#

systemctl restart valkey

[3]	On all Nodes, if Firewalld is running, allow service.

[root@dlp ~]#

firewall-cmd --add-service=redis

success
[root@dlp ~]#

firewall-cmd --runtime-to-permanent

success

[4]	Verify statistics on Replica Hosts, then it's OK if [master_link_status:up] is shown.

[root@node01 ~]#

valkey-cli

127.0.0.1:6379> auth password 
OK

# show statistics
127.0.0.1:6379> info Replication 
# Replication
role:slave
master_host:10.0.0.30
master_port:6379
master_link_status:up
master_last_io_seconds_ago:4
master_sync_in_progress:0
slave_read_repl_offset:56
slave_repl_offset:56
replicas_repl_buffer_size:0
replicas_repl_buffer_peak:0
slave_priority:100
slave_read_only:1
replica_announced:1
connected_slaves:0
replicas_waiting_psync:0
master_failover_state:no-failover
master_replid:99ee5ccf361042ae9fed4e86a635f154b0bd2c99
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:56
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:10485760
repl_backlog_first_byte_offset:1
repl_backlog_histlen:56

# verify to get keys set on Primary Host
127.0.0.1:6379> get key_on_master 
"value_on_master"

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