18. Redis 管理命令-查看服务器状态

「爱情、让人受尽委屈。」 2022-02-02 10:01 623阅读 0赞

Redis 提供了info 命令, 可以查看Redis 服务器的相关信息。

## 1. info 命令格式 ##

info 命令可以查询redis 服务器的相关信息, 默认查看全部的信息。也可以查看具体某部分信息, 支持的参数有:

*  keyspace: 数据库的相关统计
 *  clients: 查看当前服务器的客户端连接数量等信息
 *  commandstats: Redis命令统计
 *  memory: 查看redis内存占用和峰值设置
 *  cpu: 统计CPU的消耗
 *  replication: 主/从复制信息
 *  server: Redis服务器的一般信息
 *  persistence: RDB和AOF相关信息
 *  stats: 一般统计
 *  cluster: Redis集群信息

### 1.1 查看各数据库key情况 ###

*  keys: 当前数据库中key总数量
 *  expires: 当前数据库中设置了过期时间的key的数量

127.0.0.1:6379> info keyspace
    
    # Keyspace
    db0:keys=2,expires=0,avg_ttl=0
    db1:keys=1,expires=0,avg_ttl=0
    db2:keys=1,expires=0,avg_ttl=0

### 1.2 查看Redis 客户端连接数 ###

127.0.0.1:6379> info clients
    
    # Clients
    connected_clients:3
    client_recent_max_input_buffer:2
    client_recent_max_output_buffer:0
    blocked_clients:0

### 1.3 查看命令执行次数统计 ###

127.0.0.1:6379> info commandstats
    
    # Commandstats
    cmdstat_exists:calls=2,usec=12,usec_per_call=6.00
    cmdstat_role:calls=1,usec=8,usec_per_call=8.00
    cmdstat_type:calls=4,usec=23,usec_per_call=5.75
    cmdstat_setbit:calls=18,usec=140,usec_per_call=7.78
    cmdstat_keys:calls=12,usec=151,usec_per_call=12.58
    cmdstat_expire:calls=4,usec=32,usec_per_call=8.00
    cmdstat_time:calls=1,usec=3,usec_per_call=3.00

### 1.4 查看内存 ###

127.0.0.1:6379> info memory
    
    # Memory
    used_memory:637888
    used_memory_human:622.94K
    used_memory_rss:5570560
    used_memory_rss_human:5.31M
    used_memory_peak:701328
    used_memory_peak_human:684.89K
    used_memory_peak_perc:90.95%
    used_memory_overhead:613428
    used_memory_startup:512648
    used_memory_dataset:24460
    used_memory_dataset_perc:19.53%
    allocator_allocated:1139440
    allocator_active:1523712
    allocator_resident:7806976
    total_system_memory:8268652544
    total_system_memory_human:7.70G
    used_memory_lua:37888
    used_memory_lua_human:37.00K
    used_memory_scripts:0
    used_memory_scripts_human:0B
    number_of_cached_scripts:0
    maxmemory:0
    maxmemory_human:0B
    maxmemory_policy:noeviction
    allocator_frag_ratio:1.34
    allocator_frag_bytes:384272
    allocator_rss_ratio:5.12
    allocator_rss_bytes:6283264
    rss_overhead_ratio:0.71
    rss_overhead_bytes:-2236416
    mem_fragmentation_ratio:9.33
    mem_fragmentation_bytes:4973688
    mem_not_counted_for_evict:0
    mem_replication_backlog:0
    mem_clients_slaves:0
    mem_clients_normal:100460
    mem_aof_buffer:0
    mem_allocator:jemalloc-5.1.0
    active_defrag_running:0
    lazyfree_pending_objects:0

### 1.5 查看cpu ###

127.0.0.1:6379> info cpu
    
    # CPU
    used_cpu_sys:51.677294
    used_cpu_user:56.132481
    used_cpu_sys_children:0.002255
    used_cpu_user_children:0.006267

### 1.6 查看主从 ###

127.0.0.1:6379> info replication
    
    # Replication
    role:master
    connected_slaves:0
    master_replid:26639fafdfe16db738d4315ed49dabf42a4c4b44
    master_replid2:0000000000000000000000000000000000000000
    master_repl_offset:0
    second_repl_offset:-1
    repl_backlog_active:0
    repl_backlog_size:1048576
    repl_backlog_first_byte_offset:0
    repl_backlog_histlen:0

### 1.7 查看服务器相关信息 ###

127.0.0.1:6379> info server
    
    # Server
    #redis 版本号
    redis_version:5.0.4
    redis_git_sha1:00000000
    redis_git_dirty:0
    redis_build_id:8c41f1f4b4d10d62
    redis_mode:standalone
    os:Linux 4.15.0-20-generic x86_64
    arch_bits:64
    multiplexing_api:epoll
    atomicvar_api:atomic-builtin
    gcc_version:7.3.0
    # 进程id
    process_id:7981
    run_id:260bd91704038cb639575dbd95843dafda6978b0
    tcp_port:6379
    uptime_in_seconds:74878
    uptime_in_days:0
    hz:10
    configured_hz:10
    lru_clock:13793393
    # 启动命令
    executable:/usr/local/src/redis-5.0.4/redis-server
    # 配置文件
    config_file:/usr/local/src/redis-5.0.4/redis.conf