[Feature] SENTINEL SUBCOMMANDS

[duongcongtoai]

Sentinels have those commands

• SENTINEL masters, provides a list of configured masters.
• SENTINEL slaves , provides a list of slaves for the master with the specified name.
• SENTINEL sentinels , provides a list of sentinels for the master with the specified name.
• SENTINEL is-master-down-by-addr , returns a two elements multi bulk reply where the first element is :0 or :1, and the second is the Subjective Leader for the failover.
• CKQUORUM , Check if the current Sentinel configuration is able to reach the quorum needed to failover a master and the majority needed to authorize the failover.
• CONFIG SET , Set a global Sentinel configuration parameter.
• CONFIG GET Get global Sentinel configuration parameter.
• GET-MASTER-ADDR-BY-NAME Return the ip and port number of the master with that name.
• FAILOVER Manually failover a master node without asking for agreement from other Sentinels
• FLUSHCONFIG Force Sentinel to rewrite its configuration on disk, including the current Sentinel state
• MONITOR name ip port quorum , Start monitoring a new master with the specified name, ip, port and quorum.
• MYID Return the ID of the Sentinel instance.
• REMOVE master-name Remove master from Sentinel's monitor list.
• REPLICAS Show a list of replicas for this master and their state.
• RESET Reset masters for specific master name matching this pattern.
• SENTINELS Show a list of Sentinel instances for this master and their state.
• SET Set configuration parameters for certain masters.
• SIMULATE-FAILURE (CRASH-AFTER-ELECTION|CRASH-AFTER-PROMOTION|HELP) Simulate a Sentinel crash.

Cmds that are important:

• SENTINEL is-master-down-by-addr , returns a two elements multi bulk reply where the first element is :0 or :1, and the second is the Subjective Leader for the failover.
• GET-MASTER-ADDR-BY-NAME Return the ip and port number of the master with that name.
• MONITOR <name> <ip> <port> <quorum> Start monitoring a new master with the specified name, ip, port and quorum.
• SENTINELS Show a list of Sentinel instances for this master and their state.