实验环境单机版启动6个reids实例
端口号分别为 6381 6382 6383 6384 6385 6386
1) 下载redis-6.0.1.tar.gz
wget http://download.redis.io/releases/redis-6.0.1.tar.gz
2) 创建集群目录和解压编译
# 2.1 创建集群目录
mkdir /mnt/redis-cluster -p
#2.2 解压和建立软连接 编译
tar -xf redis-6.0.1.tar.gz -C /mnt/redis-cluster/
cd /mnt/redis-cluster/
ln -s redis-6.0.1/ redis
cd redis
make && make install
# 有时候安装了gcc gcc-c++ autoconf直接make还是会报错,可能是gcc的版本太低
# 查看gcc版本是否在5.3以上，centos7.6默认安装4.8.5
gcc -v
# 升级gcc到5.3及以上,如下：
升级到gcc 9.3：
yum -y install centos-release-scl
yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils
# 临时使用高版本的gcc退出shell或重启就会恢复原系统gcc版本
scl enable devtoolset-9 bash
# 如果想一直生效请
echo "source /opt/rh/devtoolset-9/enable" >>/etc/profile
source /etc/profile
3) 部署redis的配置文件并启动
cd /mnt/redis-cluster/
# 部署redis脚本
cat > deploy-redis-conf.sh << EOF
#!/bin/bash
# conf: 放配置文件
# log: 放日志文件
# pid: 放pid文件
# data: 数据目录
for i in {1..6}
do
mkdir /mnt/redis-cluster/638\${i}/{conf,log,pid,data} -p
echo """
bind 0.0.0.0
port 6379
daemonize yes
logfile /mnt/redis-cluster/6379/log/redis_6379.log
pidfile /mnt/redis-cluster/6379/pid/redis_6379.pid
loglevel notice
maxmemory 268435456
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dir /mnt/redis-cluster/6379/data
dbfilename dump-6379.rdb
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
""" > /mnt/redis-cluster/638\${i}/conf/redis.conf
sed -i "s/6379/638\${i}/g" /mnt/redis-cluster/638\${i}/conf/redis.conf
done
EOF
# redis集群启动脚本
cat > start-redis.sh << EOF
#!/bin/bash
for i in {1..6}
do
redis-server /mnt/redis-cluster/638\${i}/conf/redis.conf
sleep 0.05
done
EOF
# redis集群停止脚本
cat > stop-redis.sh << EOF
#!/bin/bash
for i in {1..6}
do
redis-cli -p 638\${i} shutdown
sleep 0.05
done
EOF
chmod +x deploy-redis-conf.sh start-redis.sh stop-redis.sh
./deploy-redis-conf.sh
./start-redis.sh
# 查看redis启动情况
ps aux | grep redis
root 6877 0.0 0.2 165328 7892 ? Ssl 00:13 0:00 redis-server 0.0.0.0:6381 [cluster]
root 6884 0.0 0.2 165328 7892 ? Ssl 00:13 0:00 redis-server 0.0.0.0:6382 [cluster]
root 6891 0.0 0.2 165328 7896 ? Ssl 00:13 0:00 redis-server 0.0.0.0:6383 [cluster]
root 6898 0.2 0.2 165328 7892 ? Ssl 00:13 0:00 redis-server 0.0.0.0:6384 [cluster]
root 6905 0.0 0.2 165328 7900 ? Ssl 00:13 0:00 redis-server 0.0.0.0:6385 [cluster]
root 6912 0.0 0.2 165328 7896 ? Ssl 00:13 0:00 redis-server 0.0.0.0:6386 [cluster]
root 6919 0.0 0.0 112716 968 pts/0 R+ 00:13 0:00 grep --color=auto redis
4) 启动redis集群
# 启动集群
redis-cli --cluster create 127.0.0.1:6381 127.0.0.1:6382 127.0.0.1:6383 127.0.0.1:6384 127.0.0.1:6385 127.0.0.1:6386 --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 127.0.0.1:6385 to 127.0.0.1:6381
Adding replica 127.0.0.1:6386 to 127.0.0.1:6382
Adding replica 127.0.0.1:6384 to 127.0.0.1:6383
......
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
......
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
# 检查集群状态
redis-cli --cluster check 127.0.0.1:6381
127.0.0.1:6381 (32a23583...) -> 0 keys | 5461 slots | 1 slaves.
127.0.0.1:6383 (27b01789...) -> 0 keys | 5461 slots | 1 slaves.
127.0.0.1:6382 (dd45dd58...) -> 0 keys | 5462 slots | 1 slaves.
[OK] 0 keys in 3 masters.
......
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
5) 调整集群主从关系
登录到要改变的从节点然后执行 CLUSTER REPLICATE 想要成为那个主节点的那个节点的id号
如：你想让6384从节点 成为6383主节点的从
redis-cli --cluster check 127.0.0.1:6381
aaa.png
# 登录6384从节点
redis-cli -c -p 6384
127.0.0.1:6384> CLUSTER REPLICATE 5ad2ad6130671b74af23fac2bd85ba82bb4c1619
OK
# 5ad2ad6130671b74af23fac2bd85ba82bb4c1619 为6383主节点的id
6) 测试集群
cat > for.sh << EOF
#!/bin/bash
for i in {1..10000}
do
redis-cli -c -p 6381 set key\${i} value\${i}
done
EOF
chmod +x for.sh
./for.sh
# 查看分配情况
redis-cli --cluster info 127.0.0.1:6381
127.0.0.1:6381 (35bf9c0e...) -> 3331 keys | 5461 slots | 1 slaves.
127.0.0.1:6382 (a9945ee2...) -> 3341 keys | 5462 slots | 1 slaves.
127.0.0.1:6383 (5ad2ad61...) -> 3328 keys | 5461 slots | 1 slaves.
[OK] 10000 keys in 3 masters.
0.61 keys per slot on average.
redis-cli --cluster rebalance 127.0.0.1:6381
>>> Performing Cluster Check (using node 127.0.0.1:6381)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
*** No rebalancing needed! All nodes are within the 2.00% threshold.
7) 停止redis集群
/mnt/redis-cluster/stop-redis.sh
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