Part1Redis 6.X Cluster 集群搭建

码哥带大家完成在 CentOS 7 中安装 Redis 6.x 教程。在学习 Redis Cluster 集群之前，我们需要先搭建一套集群环境。机器有限，实现目标是一台机器上搭建 6 个节点，构成一个三主三从集群模式。

1下载解压

可直接到 Redis 官网下载最新稳定包，地址：https://redis.io/download。或者使用 命令：sudo wget http://download.redis.io/releases/redis-6.0.9.tar.gz 下载安装包.。

码哥统一把软件包放在 /opt/soft 目录下，并创建目录 mkdir redisCluster用于放置集群配置文件。在 redisCluster 目录下执行 mkdir 7000 7001 7002 7003 7004 7005 创建 6 个目录分别对应每个节点 redis.conf 配置模板。

tar -zxf redis-6.0.9.tar.gz -C redisCluster 解压到 redisCluster 目录中。

2make 编译

在编译之前我们需要确认 gcc 版本，自 redis 6.0.0 之后，编译 redis 需要支持 C11 特性，C11 特性在 4.9 中被引入。Centos 7 默认 gcc 版本为 4.8.5，所以需要升级gcc版本。

编译错误

否则在编译过程中会遇到如下错误日志：

1. In file included from server.c:31:0:
2. server.c:4999:59: error: ‘struct redisServer’ has no member named ‘cluster’
3. (server.cluster_enabled && nodeIsMaster(server.cluster->myself)));
4. ^
5. cluster.h:58:27: note: in definition of macro ‘nodeIsMaster’
6. #define nodeIsMaster(n) ((n)->flags & CLUSTER_NODE_MASTER)
7. ^
8. server.c: In function ‘main’:
9. server.c:5047:11: error: ‘struct redisServer’ has no member named ‘sentinel_mode’
10. server.sentinel_mode = checkForSentinelMode(argc,argv);
11. ^
12. server.c:5064:15: error: ‘struct redisServer’ has no member named ‘sentinel_mode’
13. if (server.sentinel_mode) {
14. ^
15. server.c:5131:19: error: ‘struct redisServer’ has no member named ‘sentinel_mode’
16. if (server.sentinel_mode && configfile && *configfile == '-') {
17. ^
18. server.c:5153:168: error: ‘struct redisServer’ has no member named ‘sentinel_mode’
19. serverLog(LL_WARNING, "Warning: no config file specified, using the default config. In order to specify a config file use %s /path/to/%s.conf", argv[0], server.sentinel_mode ? "sentinel" : "redis");
20. ^
21. server.c:5158:11: error: ‘struct redisServer’ has no member named ‘supervised’
22. server.supervised = redisIsSupervised(server.supervised_mode);
23. ^
24. server.c:5158:49: error: ‘struct redisServer’ has no member named ‘supervised_mode’
25. server.supervised = redisIsSupervised(server.supervised_mode);
26. ^
27. server.c:5159:28: error: ‘struct redisServer’ has no member named ‘daemonize’
28. int background = server.daemonize && !server.supervised;
29. ^
30. server.c:5159:49: error: ‘struct redisServer’ has no member named ‘supervised’
31. int background = server.daemonize && !server.supervised;
32. ^
33. server.c:5163:29: error: ‘struct redisServer’ has no member named ‘pidfile’
34. if (background || server.pidfile) createPidFile();
35. ^
36. server.c:5168:16: error: ‘struct redisServer’ has no member named ‘sentinel_mode’
37. if (!server.sentinel_mode) {
38. ^
39. server.c:5178:19: error: ‘struct redisServer’ has no member named ‘cluster_enabled’
40. if (server.cluster_enabled) {
41. ^
42. server.c:5186:19: error: ‘struct redisServer’ has no member named ‘ipfd_count’
43. if (server.ipfd_count > 0 || server.tlsfd_count > 0)
44. ^
45. server.c:5186:44: error: ‘struct redisServer’ has no member named ‘tlsfd_count’
46. if (server.ipfd_count > 0 || server.tlsfd_count > 0)
47. ^
48. server.c:5188:19: error: ‘struct redisServer’ has no member named ‘sofd’
49. if (server.sofd > 0)
50. ^
51. server.c:5189:94: error: ‘struct redisServer’ has no member named ‘unixsocket’
52. serverLog(LL_NOTICE,"The server is now ready to accept connections at %s", server.unixsocket);
53. ^
54. server.c:5190:19: error: ‘struct redisServer’ has no member named ‘supervised_mode’
55. if (server.supervised_mode == SUPERVISED_SYSTEMD) {
56. ^
57. server.c:5191:24: error: ‘struct redisServer’ has no member named ‘masterhost’
58. if (!server.masterhost) {
59. ^
60. server.c:5201:19: error: ‘struct redisServer’ has no member named ‘supervised_mode’
61. if (server.supervised_mode == SUPERVISED_SYSTEMD) {
62. ^
63. server.c:5208:15: error: ‘struct redisServer’ has no member named ‘maxmemory’
64. if (server.maxmemory > 0 && server.maxmemory < 1024*1024) {
65. ^
66. server.c:5208:39: error: ‘struct redisServer’ has no member named ‘maxmemory’
67. if (server.maxmemory > 0 && server.maxmemory < 1024*1024) {
68. ^
69. server.c:5209:176: error: ‘struct redisServer’ has no member named ‘maxmemory’
70. serverLog(LL_WARNING,"WARNING: You specified a maxmemory value that is less than 1MB (current value is %llu bytes). Are you sure this is what you really want?", server.maxmemory);
71. ^
72. server.c:5212:31: error: ‘struct redisServer’ has no member named ‘server_cpulist’
73. redisSetCpuAffinity(server.server_cpulist);
74. ^
75. server.c: In function ‘hasActiveChildProcess’:
76. server.c:1480:1: warning: control reaches end of non-void function [-Wreturn-type]
77. }
78. ^
79. server.c: In function ‘allPersistenceDisabled’:
80. server.c:1486:1: warning: control reaches end of non-void function [-Wreturn-type]
81. }
82. ^
83. server.c: In function ‘writeCommandsDeniedByDiskError’:
84. server.c:3826:1: warning: control reaches end of non-void function [-Wreturn-type]
85. }
86. ^
87. server.c: In function ‘iAmMaster’:
88. server.c:5000:1: warning: control reaches end of non-void function [-Wreturn-type]
89. }
90. ^
91. ....

解决方式

1. yum -y install gcc gcc-c++ make tcl
2. yum -y install centos-release-scl
3. yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils
4. scl enable devtoolset-9 bash

升级之后便可解决 make 报错问题。

注意：scl命令启用只是临时的，退出xshell或者重启就会恢复到原来的gcc版本。如果要长期生效的话，执行如下 sudo echo "source /opt/rh/devtoolset-9/enable" >>/etc/profile。

cd /opt/soft/redisCluster/redis-6.0.9 切换到目录执行 make 。

编译完成使用 make install 对 redis 进行安装 ，命令：sudo make install。

3修改配置文件

cd /opt/soft/redisCluster/redis-6.0.9 将 redis.conf 分别复制到 7000 7001 7002 7003 7004 目录中。

分别修改 6 个 redis.conf

1. ## 7000-7005端口
2. port 7000
3. ## 后台启动
4. daemonize yes
5. ## 如果是在单机模拟集群必须指定bind的IP，如果不修改ip的话使用程序连接集群会报错
6. bind 192.168.221.150
7. ## 开启redis-cluster集群
8. cluster-enabled yes
9. ## 每个实例还包含存储此节点配置的文件的路径，默认情况下为nodes.conf，自动创建
10. cluster-config-file nodes_7000.conf
11. ## 超时
12. cluster-node-timeout 500
13. ## 开启aof
14. appendonly yes
16. #注释cluster集群下不允许复制。
17. #replicaof 127.0.0.1 9000
18. #关闭保护模式,如果开启需要设置密码，比较繁琐，可根据自己的需求来
19. protected-mode no

每个配置文件只需要修改 port 和 cluster-config-file 就可以了。

4启动节点并创建集群

启动节点

进入 redisCluster 目录，执行指令依次启动每个节点。redis-6.0.9/src/redis-server 700x/redis.conf 注意指定每个节点配置文件，如果不指定配置文件会默认使用src下的配置。

创建集群

进入任意一个节点，执行以下指令创建集群

指令如下：

1. redis-6.0.9/src/redis-cli --cluster create 172.16.90.152:7000 172.16.90.152:7001 172.16.90.152:7002 172.16.90.152:7003 172.16.90.152:7004 172.16.90.152:7005 --cluster-replicas 1

集群参数解释：

• cluster-replicas 1：表示希望为集群中的每个主节点创建一个从节点(一主一从)。
• cluster-replicas 2：表示希望为集群中的每个主节点创建两个从节点(一主二从)。

控制台响应：

1. >>> Performing hash slots allocation on 6 nodes...
2. Master[0] -> Slots 0 - 5460
3. Master[1] -> Slots 5461 - 10922
4. Master[2] -> Slots 10923 - 16383
5. Adding replica 172.16.90.152:7004 to 172.16.90.152:7000
6. Adding replica 172.16.90.152:7005 to 172.16.90.152:7001
7. Adding replica 172.16.90.152:7003 to 172.16.90.152:7002
8. >>> Trying to optimize slaves allocation for anti-affinity
9. [WARNING] Some slaves are in the same host as their master
10. M: 06c56f5a6a4436108fae931be499465985141d39 172.16.90.152:7000
11. slots:[0-5460] (5461 slots) master
12. M: 0ab7c9efd97319d94a8ea52452ec58f7708d812d 172.16.90.152:7001
13. slots:[5461-10922] (5462 slots) master
14. M: 096f076d99363270c02785a2fb298e2ee65d3f07 172.16.90.152:7002
15. slots:[10923-16383] (5461 slots) master
16. S: 69d621060295eb433af3e34e702142df0fd4d73d 172.16.90.152:7003
17. replicates 06c56f5a6a4436108fae931be499465985141d39
18. S: 1d37df0aa0e2310aedb5a380f95cc818256003f8 172.16.90.152:7004
19. replicates 0ab7c9efd97319d94a8ea52452ec58f7708d812d
20. S: d9204f6da875a4b2522c5fa25d9e6c1f95cf51ea 172.16.90.152:7005
21. replicates 096f076d99363270c02785a2fb298e2ee65d3f07
22. Can I set the above configuration? (type 'yes' to accept):

Can I set the above configuration? (type 'yes' to accept): 询问是否确认节点 slots 分配方案， 我们输入 ‘yes’。

1. >>> Nodes configuration updated
2. >>> Assign a different config epoch to each node
3. >>> Sending CLUSTER MEET messages to join the cluster
4. Waiting for the cluster to join
5. .
6. >>> Performing Cluster Check (using node 172.16.90.152:7000)
7. M: 06c56f5a6a4436108fae931be499465985141d39 172.16.90.152:7000
8. slots:[0-5460] (5461 slots) master
9. 1 additional replica(s)
10. S: 1d37df0aa0e2310aedb5a380f95cc818256003f8 172.16.90.152:7004
11. slots: (0 slots) slave
12. replicates 0ab7c9efd97319d94a8ea52452ec58f7708d812d
13. M: 0ab7c9efd97319d94a8ea52452ec58f7708d812d 172.16.90.152:7001
14. slots:[5461-10922] (5462 slots) master
15. 1 additional replica(s)
16. S: d9204f6da875a4b2522c5fa25d9e6c1f95cf51ea 172.16.90.152:7005
17. slots: (0 slots) slave
18. replicates 096f076d99363270c02785a2fb298e2ee65d3f07
19. S: 69d621060295eb433af3e34e702142df0fd4d73d 172.16.90.152:7003
20. slots: (0 slots) slave
21. replicates 06c56f5a6a4436108fae931be499465985141d39
22. M: 096f076d99363270c02785a2fb298e2ee65d3f07 172.16.90.152:7002
23. slots:[10923-16383] (5461 slots) master
24. 1 additional replica(s)
25. [OK] All nodes agree about slots configuration.
26. >>> Check for open slots...
27. >>> Check slots coverage...
28. [OK] All 16384 slots covered.

[OK] All 16384 slots covered.

到此完成!

5查看集群状态

redis-6.0.9/src/redis-cli --cluster check 172.16.90.152:7000

6注意事项

当使用 redis-6.0.9/src/redis-cli --cluster create 172.16.90.152:7000 172.16.90.152:7001 172.16.90.152:7002 172.16.90.152:7003 172.16.90.152:7004 172.16.90.152:7005 --cluster-replicas 1 创建集群以后，一次创建，永久使用。之后直接启动每个节点即可构建集群。

结束命令：redis-6.0.9/src/redis-cli -c -h 192.168.124.23 -p 7004 shutdown

进入集群命令 redis-cli -c -h host -p prot 不带-c 参数进入的不是集群

搭建好集群后，期待下一篇「Redis 高可用篇：Cluster 能支持的数据有多大?」

原文地址：https://mp.weixin.qq.com/s/gmTCxw92Ts0-lJs61DKztA

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