1. Installation
Installation introduction: Install 6 nodes, 3 master nodes, and 3 slave nodes. Since redis requires 3 master nodes by default, if you want each master node to have a slave node, this is the minimum configuration requirement. The ports are all 6379.
Note: During installation, attention should be paid to ensure that the active and standby machines are on different physical machines.
1.1. Installation preparation
Software: redis-3.2.5
Create a redis user and extract redis-3.2.5.tar.gz to the /home/redis/ directory.
wget http://download.redis.io/releases/redis-3.2.5.tar.gz
3.2.5 is the official recommended stable release version
1.2, modify the configuration
All 6 nodes modify the redis.conf file in the redis-3.2.5 directory
daemonize yes # redis is not started in the background by default, here is modified to start in the background cluster-enabled yes # Allow redis to support cluster mode cluster-config-file nodes.conf # node configuration file cluster-node-timeout 15000 # Node timeout in milliseconds appendonly yes dir /data/redis/ #redis backup file storage location maxmemory 21474836480 #redis maximum memory usage is 20G
（maxmemory-policy noeviction ，don't expire at all, just return an error on write operations）
and execute on 6 nodes
make
make install
1.3, start the instance
Execute src/redis-server redis.conf on 6 nodes respectively, and start 6 redis instances on 6 nodes
1.4, build a redis cluster
Select a node and operate the following command.
Install ruby environment
| yum -y install ruby yum -y install rubygem |
Install ruby's redis api
| gem install -l ./redis-3.2.2.gem |
Start the cluster.
| ./redis-trib.rb create --replicas 1 xxx.xxx.xx.140:6379 xxx.xxx.xx.141:6379 xxx.xxx.xx.143:6379 xxx.xxx.xx.145:6379 xxx.xxx.xx.147:6379 xxx.xxx.xx.148:6379 |
--replicas 1 means that we want to create a slave node for each master node in the cluster. Since a redis cluster requires at least 3 master nodes, if we need a slave node for each master node, then a minimum of 6 machines (or say 6 instances). 145, 147, and 148 will be the master nodes, and 140, 141, and 143 will be called slave nodes of the master node in turn. (It seems that the last 3 are the main ones, and the first 3 are spares)
1.5. Test cluster
./redis-cli -c
1.6, stop the redis instance
At this stage, the running status of the redis server is monitored. We use the command script that comes with redis to explain the corresponding parameter items by ourselves.
$ ps -ef | grep redis redis 15540 1 0 Jun23 ? 00:17:18 src/redis-server *:6379 [cluster] $ kill -9 15540
2. Monitoring
2.1. Monitoring content
At this stage, the running status of the redis server is monitored. We use the command script that comes with redis to explain the corresponding parameter items by ourselves.
[redis@kzx-zczq13 redis-3.2.5]$ src/redis-cli -c 127.0.0.1:6379> info # Server redis_version:3.2.5 redis_git_sha1:00000000 redis_git_dirty:0 redis_build_id:c1345887f338f67c redis_mode:cluster os:Linux 2.6.32-431.el6.x86_64 x86_64 arch_bits:64 multiplexing_api:epoll gcc_version:4.4.7 process_id:15540 run_id:898d9c378eac7b4db48fa83f0ccb9c9998a8f295 tcp_port:6379 uptime_in_seconds:1037501 uptime_in_days:12 hz:10 lru_clock:8093545 config_file:/home/redis/redis-3.2.5/redis.conf # Clients connected_clients:2 client_longest_output_list:0 client_biggest_input_buf:0 blocked_clients:0 # Memory used_memory:9513768 used_memory_human:9.07M used_memory_rss:16265216 used_memory_peak:9513768 used_memory_peak_human:9.07M used_memory_lua:36864 mem_fragmentation_ratio:1.71 mem_allocator:jemalloc-3.6.0 # Persistence loading:0 rdb_changes_since_last_save:0 rdb_bgsave_in_progress:0 rdb_last_save_time:1467710054 rdb_last_bgsave_status:ok rdb_last_bgsave_time_sec:1 rdb_current_bgsave_time_sec:-1 aof_enabled:1 aof_rewrite_in_progress:0 aof_rewrite_scheduled:0 aof_last_rewrite_time_sec:0 aof_current_rewrite_time_sec:-1 aof_last_bgrewrite_status:ok aof_last_write_status:ok aof_current_size:1958322 aof_base_size:0 aof_pending_rewrite:0 aof_buffer_length:0 aof_rewrite_buffer_length:0 aof_pending_bio_fsync:0 aof_delayed_fsync:0 # Stats total_connections_received:7 total_commands_processed:142817 instantaneous_ops_per_sec:0 total_net_input_bytes:3407347 total_net_output_bytes:40598277 instantaneous_input_kbps:0.00 instantaneous_output_kbps:0.05 rejected_connections:0 sync_full:0 sync_partial_ok:0 sync_partial_err:0 expired_keys:0 evicted_keys:0 keyspace_hits:0 keyspace_misses:0 pubsub_channels:0 pubsub_patterns:0 latest_fork_usec:857 migrate_cached_sockets:0 # Replication role:slave master_host:22.104.166.77 master_port:6379 master_link_status:up master_last_io_seconds_ago:2 master_sync_in_progress:0 slave_repl_offset:3406433 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 # CPU used_cpu_sys:679.89 used_cpu_user:358.52 used_cpu_sys_children:0.23 used_cpu_user_children:0.44 # Cluster cluster_enabled:1 # Keyspace db0:keys=38782,expires=0,avg_ttl=0
2.2、查看主从信息
127.0.0.1:6379> cluster nodes 455c329c3d3d4d00d6711dba5d350b832209ae56 22.104.166.73:6379 slave 4138a8dbfff68cb73e6acb11e7a3b93344b7f6d2 0 1467711490518 5 connected dbcb30cb58cbc8fcc138a43b64aac60f63fe8e7c 22.104.166.72:6379 slave 8094e32bfd639448bca02ef5189cd62bca78b7ad 0 1467711491519 4 connected 7c7f42d7442f8037acfb7695ebf182548cae82e0 22.104.166.74:6379 myself,slave 036b37d9e680d79f196b63d2bc1d31ee65a72310 0 0 3 connected 8094e32bfd639448bca02ef5189cd62bca78b7ad 22.104.166.75:6379 master - 0 1467711488512 4 connected 10923-16383 4138a8dbfff68cb73e6acb11e7a3b93344b7f6d2 22.104.166.76:6379 master - 0 1467711492521 5 connected 5461-10922 036b37d9e680d79f196b63d2bc1d31ee65a72310 22.104.166.77:6379 master - 0 1467711485504 6 connected 0-5460