Redis 6-X Cluster 集羣搭建
Part1Redis 6.X Cluster 集羣搭建
碼哥帶大家完成在 CentOS 7 中安裝 Redis 6.x 教程。在學習 Redis Cluster 集羣之前,我們需要先搭建一套集羣環境。機器有限,實現目標是一臺機器上搭建 6 個節點,構成一個三主三從集羣模式。
1 下載解壓
可直接到 Redis 官網下載最新穩定包,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
下載安裝包.。
-
碼哥統一把軟件包放在
/opt/soft
目錄下,並創建目錄mkdir redisCluster
用於放置集羣配置文件。在 redisCluster 目錄下執行mkdir 7000 7001 7002 7003 7004 7005
創建 6 個目錄分別對應每個節點 redis.conf 配置模板。 -
tar -zxf redis-6.0.9.tar.gz -C redisCluster
解壓到 redisCluster 目錄中。
2make 編譯
在編譯之前我們需要確認 gcc 版本,自 redis 6.0.0 之後,編譯 redis 需要支持 C11 特性,C11 特性在 4.9 中被引入。Centos 7 默認 gcc 版本爲 4.8.5,所以需要升級 gcc 版本。
編譯錯誤
否則在編譯過程中會遇到如下錯誤日誌:
In file included from server.c:31:0:
server.c:4999:59: error: ‘struct redisServer’ has no member named ‘cluster’
(server.cluster_enabled && nodeIsMaster(server.cluster->myself)));
^
cluster.h:58:27: note: in definition of macro ‘nodeIsMaster’
#define nodeIsMaster(n) ((n)->flags & CLUSTER_NODE_MASTER)
^
server.c: In function ‘main’:
server.c:5047:11: error: ‘struct redisServer’ has no member named ‘sentinel_mode’
server.sentinel_mode = checkForSentinelMode(argc,argv);
^
server.c:5064:15: error: ‘struct redisServer’ has no member named ‘sentinel_mode’
if (server.sentinel_mode) {
^
server.c:5131:19: error: ‘struct redisServer’ has no member named ‘sentinel_mode’
if (server.sentinel_mode && configfile && *configfile == '-') {
^
server.c:5153:168: error: ‘struct redisServer’ has no member named ‘sentinel_mode’
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");
^
server.c:5158:11: error: ‘struct redisServer’ has no member named ‘supervised’
server.supervised = redisIsSupervised(server.supervised_mode);
^
server.c:5158:49: error: ‘struct redisServer’ has no member named ‘supervised_mode’
server.supervised = redisIsSupervised(server.supervised_mode);
^
server.c:5159:28: error: ‘struct redisServer’ has no member named ‘daemonize’
int background = server.daemonize && !server.supervised;
^
server.c:5159:49: error: ‘struct redisServer’ has no member named ‘supervised’
int background = server.daemonize && !server.supervised;
^
server.c:5163:29: error: ‘struct redisServer’ has no member named ‘pidfile’
if (background || server.pidfile) createPidFile();
^
server.c:5168:16: error: ‘struct redisServer’ has no member named ‘sentinel_mode’
if (!server.sentinel_mode) {
^
server.c:5178:19: error: ‘struct redisServer’ has no member named ‘cluster_enabled’
if (server.cluster_enabled) {
^
server.c:5186:19: error: ‘struct redisServer’ has no member named ‘ipfd_count’
if (server.ipfd_count > 0 || server.tlsfd_count > 0)
^
server.c:5186:44: error: ‘struct redisServer’ has no member named ‘tlsfd_count’
if (server.ipfd_count > 0 || server.tlsfd_count > 0)
^
server.c:5188:19: error: ‘struct redisServer’ has no member named ‘sofd’
if (server.sofd > 0)
^
server.c:5189:94: error: ‘struct redisServer’ has no member named ‘unixsocket’
serverLog(LL_NOTICE,"The server is now ready to accept connections at %s", server.unixsocket);
^
server.c:5190:19: error: ‘struct redisServer’ has no member named ‘supervised_mode’
if (server.supervised_mode == SUPERVISED_SYSTEMD) {
^
server.c:5191:24: error: ‘struct redisServer’ has no member named ‘masterhost’
if (!server.masterhost) {
^
server.c:5201:19: error: ‘struct redisServer’ has no member named ‘supervised_mode’
if (server.supervised_mode == SUPERVISED_SYSTEMD) {
^
server.c:5208:15: error: ‘struct redisServer’ has no member named ‘maxmemory’
if (server.maxmemory > 0 && server.maxmemory < 1024*1024) {
^
server.c:5208:39: error: ‘struct redisServer’ has no member named ‘maxmemory’
if (server.maxmemory > 0 && server.maxmemory < 1024*1024) {
^
server.c:5209:176: error: ‘struct redisServer’ has no member named ‘maxmemory’
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);
^
server.c:5212:31: error: ‘struct redisServer’ has no member named ‘server_cpulist’
redisSetCpuAffinity(server.server_cpulist);
^
server.c: In function ‘hasActiveChildProcess’:
server.c:1480:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
server.c: In function ‘allPersistenceDisabled’:
server.c:1486:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
server.c: In function ‘writeCommandsDeniedByDiskError’:
server.c:3826:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
server.c: In function ‘iAmMaster’:
server.c:5000:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
....
解決方式
yum -y install gcc gcc-c++ make tcl
yum -y install centos-release-scl
yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils
scl enable devtoolset-9 bash
升級之後便可解決 make 報錯問題。
注意:scl 命令啓用只是臨時的,退出 xshell 或者重啓就會恢復到原來的 gcc 版本。如果要長期生效的話,執行如下 sudo echo "source /opt/rh/devtoolset-9/enable" >>/etc/profile。
cd /opt/soft/redisCluster/redis-6.0.9
切換到目錄執行 make
。
編譯完成使用 make install 對 redis 進行安裝 ,命令:sudo make install
。
3 修改配置文件
cd /opt/soft/redisCluster/redis-6.0.9
將 redis.conf 分別複製到 7000 7001 7002 7003 7004 目錄中。
分別修改 6 個 redis.conf
## 7000-7005端口
port 7000
## 後臺啓動
daemonize yes
## 如果是在單機模擬集羣必須指定bind的IP,如果不修改ip的話使用程序連接集羣會報錯
bind 192.168.221.150
## 開啓redis-cluster集羣
cluster-enabled yes
## 每個實例還包含存儲此節點配置的文件的路徑,默認情況下爲nodes.conf,自動創建
cluster-config-file nodes_7000.conf
## 超時
cluster-node-timeout 500
## 開啓aof
appendonly yes
#註釋cluster集羣下不允許複製。
#replicaof 127.0.0.1 9000
#關閉保護模式,如果開啓需要設置密碼,比較繁瑣,可根據自己的需求來
protected-mode no
每個配置文件只需要修改 port 和 cluster-config-file 就可以了。
4 啓動節點並創建集羣
啓動節點
進入 redisCluster 目錄,執行指令依次啓動每個節點。redis-6.0.9/src/redis-server 700x/redis.conf
注意指定每個節點配置文件,如果不指定配置文件會默認使用 src 下的配置。
創建集羣
進入任意一個節點,執行以下指令創建集羣
指令如下:
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
集羣參數解釋:
-
cluster-replicas 1:表示希望爲集羣中的每個主節點創建一個從節點 (一主一從)。
-
cluster-replicas 2:表示希望爲集羣中的每個主節點創建兩個從節點 (一主二從)。
控制檯響應:
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 172.16.90.152:7004 to 172.16.90.152:7000
Adding replica 172.16.90.152:7005 to 172.16.90.152:7001
Adding replica 172.16.90.152:7003 to 172.16.90.152:7002
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: 06c56f5a6a4436108fae931be499465985141d39 172.16.90.152:7000
slots:[0-5460] (5461 slots) master
M: 0ab7c9efd97319d94a8ea52452ec58f7708d812d 172.16.90.152:7001
slots:[5461-10922] (5462 slots) master
M: 096f076d99363270c02785a2fb298e2ee65d3f07 172.16.90.152:7002
slots:[10923-16383] (5461 slots) master
S: 69d621060295eb433af3e34e702142df0fd4d73d 172.16.90.152:7003
replicates 06c56f5a6a4436108fae931be499465985141d39
S: 1d37df0aa0e2310aedb5a380f95cc818256003f8 172.16.90.152:7004
replicates 0ab7c9efd97319d94a8ea52452ec58f7708d812d
S: d9204f6da875a4b2522c5fa25d9e6c1f95cf51ea 172.16.90.152:7005
replicates 096f076d99363270c02785a2fb298e2ee65d3f07
Can I set the above configuration? (type 'yes' to accept):
Can I set the above configuration? (type 'yes' to accept): 詢問是否確認節點 slots 分配方案, 我們輸入 ‘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 172.16.90.152:7000)
M: 06c56f5a6a4436108fae931be499465985141d39 172.16.90.152:7000
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 1d37df0aa0e2310aedb5a380f95cc818256003f8 172.16.90.152:7004
slots: (0 slots) slave
replicates 0ab7c9efd97319d94a8ea52452ec58f7708d812d
M: 0ab7c9efd97319d94a8ea52452ec58f7708d812d 172.16.90.152:7001
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: d9204f6da875a4b2522c5fa25d9e6c1f95cf51ea 172.16.90.152:7005
slots: (0 slots) slave
replicates 096f076d99363270c02785a2fb298e2ee65d3f07
S: 69d621060295eb433af3e34e702142df0fd4d73d 172.16.90.152:7003
slots: (0 slots) slave
replicates 06c56f5a6a4436108fae931be499465985141d39
M: 096f076d99363270c02785a2fb298e2ee65d3f07 172.16.90.152:7002
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
[OK] All 16384 slots covered.
到此完成!
5 查看集羣狀態
redis-6.0.9/src/redis-cli --cluster check 172.16.90.152:7000
6 注意事項
當使用 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
創建集羣以後,一次創建,永久使用。之後直接啓動每個節點即可構建集羣。
結束命令:redis-6.0.9/src/redis-cli -c -h 192.168.124.23 -p 7004 shutdown
進入集羣命令 redis-cli -c -h host -p prot 不帶 - c 參數進入的不是集羣
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