Docker搭建Redis?Cluster集群的教程詳解
Redis Cluster采用無中心結構,每個節(jié)點保存數據和整個集群狀態(tài),每個節(jié)點都和其他所有節(jié)點連接。
Redis Cluster提供了一種運行Redis安裝的方法,在該安裝中,數據會 在多個Redis節(jié)點之間自動分片。Redis Cluster 在分區(qū)期間還提供了一定程度的可用性,這實際上是在某些節(jié)點出現(xiàn)故障或無法通信時繼續(xù)操作的能力。但是,如果發(fā)生較大故障(例如,大多數主服務器不可用時),集群將停止運行。Redis Cluster自動分割在多個節(jié)點之間的數據集,一部分節(jié)點出現(xiàn)故障或無法與集群的其余部分通信時,繼續(xù)運行的能力。
創(chuàng)建網卡
docker network create redis --subnet 172.28.0.0/16
Redis配置
通過腳本創(chuàng)建6個 redis 配置
for port in $(seq 1 6); \ do \ mkdir -p ~/redis/node-${port}/conf touch ~/redis/node-${port}/conf/redis.conf cat << EOF > ~/redis/node-${port}/conf/redis.conf port 6379 bind 0.0.0.0 cluster-enabled yes cluster-config-file nodes.conf cluster-node-timeout 5000 cluster-announce-ip 172.28.0.1${port} cluster-announce-port 6379 cluster-announce-bus-port 16379 appendonly yes EOF done
運行容器
# 容器1 docker run -p 6371:6379 -p 16371:16379 --name redis-1 \ -v ~/redis/node-1/data:/data \ -v ~/redis/node-1/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.28.0.11 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf # 容器2 docker run -p 6372:6379 -p 16372:16379 --name redis-2 \ -v ~/redis/node-2/data:/data \ -v ~/redis/node-2/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.28.0.12 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf # 容器3 docker run -p 6373:6379 -p 16373:16379 --name redis-3 \ -v ~/redis/node-3/data:/data \ -v ~/redis/node-3/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.28.0.13 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf # 容器4 docker run -p 6374:6379 -p 16374:16379 --name redis-4 \ -v ~/redis/node-4/data:/data \ -v ~/redis/node-4/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.28.0.14 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf # 容器5 docker run -p 6375:6379 -p 16375:16379 --name redis-5 \ -v ~/redis/node-5/data:/data \ -v ~/redis/node-5/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.28.0.15 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf # 容器6 docker run -p 6376:6379 -p 16376:16379 --name redis-6 \ -v ~/redis/node-6/data:/data \ -v ~/redis/node-6/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.28.0.16 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf
創(chuàng)建集群
# 進入容器 > docker exec -it redis-1 /bin/sh # 進入容器后,在容器中創(chuàng)建集群 > redis-cli --cluster create 172.28.0.11:6379 172.28.0.12:6379 172.28.0.13:6379 172.28.0.14:6379 172.28.0.15:6379 172.28.0.16:6379 --cluster-replicas 1 >>> Performing hash slots allocation on 6 nodes... Master[0] -> Slots 0 - 5460 Master[1] -> Slots 5461 - 10922 Master[2] -> Slots 10923 - 16383 Adding replica 172.28.0.15:6379 to 172.28.0.11:6379 Adding replica 172.28.0.16:6379 to 172.28.0.12:6379 Adding replica 172.28.0.14:6379 to 172.28.0.13:6379 M: cfb09d104f563d5dea870437cf73fac266b69a30 172.28.0.11:6379 slots:[0-5460] (5461 slots) master M: 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c 172.28.0.12:6379 slots:[5461-10922] (5462 slots) master M: be4034133574260765165beac5fd1edacb63a2bd 172.28.0.13:6379 slots:[10923-16383] (5461 slots) master S: 74685c90c5aebdc8a035d288c962e22f98e994e8 172.28.0.14:6379 replicates be4034133574260765165beac5fd1edacb63a2bd S: 96b4185cc40b532b144b2ac3e2fe7213e7c13a50 172.28.0.15:6379 replicates cfb09d104f563d5dea870437cf73fac266b69a30 S: edd2e12510d921be2193df5b461033fc0f465144 172.28.0.16:6379 replicates 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c Can I set the above configuration? (type 'yes' to accept): yes >>> Nodes configuration updated >>> Assign a different config epoch to each node >>> Sending CLUSTER MEET messages to join the cluster Waiting for the cluster to join .... >>> Performing Cluster Check (using node 172.28.0.11:6379) M: cfb09d104f563d5dea870437cf73fac266b69a30 172.28.0.11:6379 slots:[0-5460] (5461 slots) master 1 additional replica(s) S: 96b4185cc40b532b144b2ac3e2fe7213e7c13a50 172.28.0.15:6379 slots: (0 slots) slave replicates cfb09d104f563d5dea870437cf73fac266b69a30 S: edd2e12510d921be2193df5b461033fc0f465144 172.28.0.16:6379 slots: (0 slots) slave replicates 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c M: be4034133574260765165beac5fd1edacb63a2bd 172.28.0.13:6379 slots:[10923-16383] (5461 slots) master 1 additional replica(s) M: 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c 172.28.0.12:6379 slots:[5461-10922] (5462 slots) master 1 additional replica(s) S: 74685c90c5aebdc8a035d288c962e22f98e994e8 172.28.0.14:6379 slots: (0 slots) slave replicates be4034133574260765165beac5fd1edacb63a2bd [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. # 啟動redis集群客戶端(-c表示集群) > redis-cli -c # 查看集群信息 > cluster info cluster_state:ok cluster_slots_assigned:16384 cluster_slots_ok:16384 cluster_slots_pfail:0 cluster_slots_fail:0 cluster_known_nodes:6 cluster_size:3 cluster_current_epoch:6 cluster_my_epoch:1 cluster_stats_messages_ping_sent:235 cluster_stats_messages_pong_sent:225 cluster_stats_messages_sent:460 cluster_stats_messages_ping_received:220 cluster_stats_messages_pong_received:235 cluster_stats_messages_meet_received:5 cluster_stats_messages_received:460 # 集群創(chuàng)建好之后,11,12,13為主節(jié)點,其余為從節(jié)點 > cluster nodes 96b4185cc40b532b144b2ac3e2fe7213e7c13a50 172.28.0.15:6379@16379 slave cfb09d104f563d5dea870437cf73fac266b69a30 0 1596856234249 5 connected edd2e12510d921be2193df5b461033fc0f465144 172.28.0.16:6379@16379 slave 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c 0 1596856234146 6 connected cfb09d104f563d5dea870437cf73fac266b69a30 172.28.0.11:6379@16379 myself,master - 0 1596856232000 1 connected 0-5460 be4034133574260765165beac5fd1edacb63a2bd 172.28.0.13:6379@16379 master - 0 1596856233000 3 connected 10923-16383 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c 172.28.0.12:6379@16379 master - 0 1596856233000 2 connected 5461-10922 74685c90c5aebdc8a035d288c962e22f98e994e8 172.28.0.14:6379@16379 slave be4034133574260765165beac5fd1edacb63a2bd 0 1596856233230 4 connected
運行測試
添加Redis緩存
會返回所添加的對應的節(jié)點,如這里返回的是12的節(jié)點
set name weijishu -> Redirected to slot [5798] located at 172.28.0.12:6379 OK
停止容器
停止剛添加緩存的對應的redis節(jié)點
docker stop redis-2
當主節(jié)點斷開之后,會自動將從節(jié)點切換為主節(jié)點,比如這里將16切換為了主節(jié)點
cluster nodes 96b4185cc40b532b144b2ac3e2fe7213e7c13a50 172.28.0.15:6379@16379 slave cfb09d104f563d5dea870437cf73fac266b69a30 0 1596856365279 5 connected edd2e12510d921be2193df5b461033fc0f465144 172.28.0.16:6379@16379 master - 0 1596856367324 7 connected 5461-10922 cfb09d104f563d5dea870437cf73fac266b69a30 172.28.0.11:6379@16379 myself,master - 0 1596856365000 1 connected 0-5460 be4034133574260765165beac5fd1edacb63a2bd 172.28.0.13:6379@16379 master - 0 1596856366814 3 connected 10923-16383 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c 172.28.0.12:6379@16379 master,fail - 1596856348392 1596856346000 2 connected 74685c90c5aebdc8a035d288c962e22f98e994e8 172.28.0.14:6379@16379 slave be4034133574260765165beac5fd1edacb63a2bd 0 1596856366301 4 connected
獲取緩存
如果能取到值,表示集群搭建成功,如下,從16這個節(jié)點中取到了值
get name -> Redirected to slot [5798] located at 172.28.0.16:6379 "weijishu"
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