redis监控命令的使用

今天来总结一下redis常用的监控命令的使用

1 info 列出redis各项信息，包括客户端连接，内存使用，持久化，节点状态，复制，CPU占用，集群相关以及内部key的数据等等信息

127.0.0.1:6379> info
# Server
redis_version:4.0.1
redis_git_sha1:00000000
redis_git_dirty:0
redis_build_id:e351e4221a69e266
redis_mode:standalone
os:Linux 2.6.32-696.6.3.el6.x86_64 x86_64
arch_bits:64
multiplexing_api:epoll
atomicvar_api:sync-builtin
gcc_version:4.4.7
process_id:1304
run_id:b8a9a806dbed21294ca504a1836d60d1758ca3f1
tcp_port:6379
uptime_in_seconds:408111
uptime_in_days:4
hz:10
lru_clock:4988755
executable:
config_file:

# Clients
connected_clients:151
client_longest_output_list:0
client_biggest_input_buf:0
blocked_clients:0

# Memory
used_memory:2628357392
used_memory_human:2.45G
used_memory_rss:3046817792
used_memory_rss_human:2.84G
used_memory_peak:2945815728
used_memory_peak_human:2.74G
used_memory_peak_perc:89.22%
used_memory_overhead:11990124
used_memory_startup:765688
used_memory_dataset:2616367268
used_memory_dataset_perc:99.57%
total_system_memory:33807302656
total_system_memory_human:31.49G
used_memory_lua:77824
used_memory_lua_human:76.00K
maxmemory:28000000000
maxmemory_human:26.08G
maxmemory_policy:allkeys-lru
mem_fragmentation_ratio:1.16
mem_allocator:jemalloc-4.0.3
active_defrag_running:0
lazyfree_pending_objects:0

# Persistence
loading:0
rdb_changes_since_last_save:77066438
rdb_bgsave_in_progress:0
rdb_last_save_time:1531307304
rdb_last_bgsave_status:ok
rdb_last_bgsave_time_sec:0
rdb_current_bgsave_time_sec:-1
rdb_last_cow_size:6467584
aof_enabled:0
aof_rewrite_in_progress:0
aof_rewrite_scheduled:0
aof_last_rewrite_time_sec:-1
aof_current_rewrite_time_sec:-1
aof_last_bgrewrite_status:ok
aof_last_write_status:ok
aof_last_cow_size:0

# Stats
total_connections_received:193221
total_commands_processed:87997146
instantaneous_ops_per_sec:4
total_net_input_bytes:4550741892
total_net_output_bytes:27495510503
instantaneous_input_kbps:0.24
instantaneous_output_kbps:0.71
rejected_connections:0
sync_full:1
sync_partial_ok:0
sync_partial_err:1
expired_keys:11693
evicted_keys:0
keyspace_hits:6810335
keyspace_misses:3773997
pubsub_channels:1
pubsub_patterns:0
latest_fork_usec:741
migrate_cached_sockets:0
slave_expires_tracked_keys:0
active_defrag_hits:0
active_defrag_misses:0
active_defrag_key_hits:0
active_defrag_key_misses:0

# Replication
role:master
connected_slaves:1
slave0:ip=10.29.112.74,port=6379,state=online,offset=4015104392,lag=1
master_replid:89eff86e8f340b395eab80de298b6550adbbc591
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:4015104672
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:4014056097
repl_backlog_histlen:1048576

# CPU
used_cpu_sys:598.48
used_cpu_user:749.88
used_cpu_sys_children:0.00
used_cpu_user_children:0.00

# Cluster
cluster_enabled:0

# Keyspace
db0:keys=84654,expires=84647,avg_ttl=768595703

2 config 通过这个命令可以获取或者设置配置参数

127.0.0.1:6379> config get maxmemory
1) "maxmemory"
2) "28000000000"

3 monitor 命令，实时监控redis收到的请求，可以用于调试

127.0.0.1:6379> monitor
OK
1531716240.339297 [0 10.81.54.246:45613] "PING"
1531716240.607214 [0 10.81.182.32:33170] "PING"
1531716240.662243 [0 10.81.182.32:33170] "PUBLISH" "__sentinel__:hello" "10.81.182.32,26379,ab87107a3603b44b0b22c511c7b99aeb260952a2,0,mymaster,10.80.178.106,6379,0"
1531716240.719811 [0 10.31.54.34:4927] "PING"
1531716240.821003 [0 10.31.54.34:4927] "PUBLISH" "__sentinel__:hello" "10.31.54.34,26379,8b7e9343b98045bedd49216a8abf73903fc94895,0,mymaster,10.80.178.106,6379,0"

可以看到上面是来自sentinel的ping请求

4 slowlog  慢日志，用来展示系统中的慢查询

127.0.0.1:6379> slowlog get 10
1) 1) (integer) 0    \\命令编号
   2) (integer) 1531715039   \\ 执行的时间戳
   3) (integer) 83061   \\ 执行耗时，单位是微秒
   4) 1) "keys"    \\执行的命令
      2) "*"       \\命令参数
   5) "127.0.0.1:13992"
   6) ""

5 dbsize  查看redis中的key数量

127.0.0.1:6379> dbsize
(integer) 84585