一、创建redis集群
环境准备6台主机10.0.0.150 10.0.0.154 10.0.0.155 10.0.0.157 10.0.0.200 10.0.0.201
集群节点，三主三从
10.0.0.150 10.0.0.154 10.0.0.155 10.0.0.157 10.0.0.200 10.0.0.201
1、安装redis脚本
bash install_redis.sh
2、更改集群配置
sed -i.bak \
-e '/masterauth/a masterauth 123456' \
-e '/# cluster-enabled yes/a cluster-enabled yes' \
-e '/# cluster-config-file nodes-6379.conf/a cluster-config-file nodes-6379.conf' \
-e '/cluster-require-full-coverage yes/a cluster-require-full-coverage no' \
/apps/redis/etc/redis.conf
systemctl enable --now redis
systemctl restart redis
3、创建集群
redis-cli -a 123456 --cluster create \
10.0.0.150:6379 \
10.0.0.154:6379 \
10.0.0.155:6379 \
10.0.0.157:6379 \
10.0.0.200:6379 \
10.0.0.201:6379 \
--cluster-replicas 1
master 150<——>200 slave
master 154<——>201 slave
master 155<——>157 slave
4、查看状态
redis-cli -a 123456 -c INFO replication
redis-cli -a 123456 cluster nodes
redis-cli -a 123456 CLUSTER INFO
附install_redis.sh
#!/bin/bash
REDIS_VERSION=redis-7.0.11
#REDIS_VERSION=redis-7.0.7
#REDIS_VERSION=redis-7.0.3
#REDIS_VERSION=redis-6.2.6
#REDIS_VERSION=redis-4.0.14
PASSWORD=123456
INSTALL_DIR=/apps/redis
CPUS=`lscpu |awk '/^CPU\(s\)/{print $2}'`
. /etc/os-release
color () {
RES_COL=60
MOVE_TO_COL="echo -en \\033[${RES_COL}G"
SETCOLOR_SUCCESS="echo -en \\033[1;32m"
SETCOLOR_FAILURE="echo -en \\033[1;31m"
SETCOLOR_WARNING="echo -en \\033[1;33m"
SETCOLOR_NORMAL="echo -en \E[0m"
echo -n "$1" && $MOVE_TO_COL
echo -n "["
if [ $2 = "success" -o $2 = "0" ] ;then
${SETCOLOR_SUCCESS}
echo -n $" OK "
elif [ $2 = "failure" -o $2 = "1" ] ;then
${SETCOLOR_FAILURE}
echo -n $"FAILED"
else
${SETCOLOR_WARNING}
echo -n $"WARNING"
fi
${SETCOLOR_NORMAL}
echo -n "]"
echo
}
prepare(){
if [ $ID = "centos" -o $ID = "rocky" ];then
yum -y install gcc make jemalloc-devel systemd-devel
else
apt update
apt -y install gcc make libjemalloc-dev libsystemd-dev
fi
if [ $? -eq 0 ];then
color "安装软件包成功" 0
else
color "安装软件包失败，请检查网络配置" 1
exit
fi
}
install() {
if [ ! -f ${REDIS_VERSION}.tar.gz ];then
wget http://download.redis.io/releases/${REDIS_VERSION}.tar.gz || { color "Redis 源码下载失败" 1 ; exit; }
fi
tar xf ${REDIS_VERSION}.tar.gz -C /usr/local/src
cd /usr/local/src/${REDIS_VERSION}
make -j $CUPS USE_SYSTEMD=yes PREFIX=${INSTALL_DIR} install && color "Redis 编译安装完成" 0 || { color "Redis 编译安装失败" 1 ;exit ; }
ln -s ${INSTALL_DIR}/bin/redis-* /usr/local/bin/
mkdir -p ${INSTALL_DIR}/{etc,log,data,run}
cp redis.conf ${INSTALL_DIR}/etc/
sed -i -e 's/bind 127.0.0.1/bind 0.0.0.0/' -e "/# requirepass/a requirepass $PASSWORD" -e "/^dir .*/c dir ${INSTALL_DIR}/data/" -e "/logfile .*/c logfile ${INSTALL_DIR}/log/redis-6379.log" -e "/^pidfile .*/c pidfile ${INSTALL_DIR}/run/redis_6379.pid" ${INSTALL_DIR}/etc/redis.conf
if id redis &> /dev/null ;then
color "Redis 用户已存在" 1
else
useradd -r -s /sbin/nologin redis
color "Redis 用户创建成功" 0
fi
chown -R redis.redis ${INSTALL_DIR}
cat >> /etc/sysctl.conf <<EOF
net.core.somaxconn = 1024
vm.overcommit_memory = 1
EOF
sysctl -p
if [ $ID = "centos" -o $ID = "rocky" ];then
echo 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' >> /etc/rc.d/rc.local
chmod +x /etc/rc.d/rc.local
/etc/rc.d/rc.local
else
echo -e '#!/bin/bash\necho never > /sys/kernel/mm/transparent_hugepage/enabled' >> /etc/rc.local
chmod +x /etc/rc.local
/etc/rc.local
fi
cat > /lib/systemd/system/redis.service <<EOF
[Unit]
Description=Redis persistent key-value database
After=network.target
[Service]
ExecStart=${INSTALL_DIR}/bin/redis-server ${INSTALL_DIR}/etc/redis.conf --supervised systemd
ExecStop=/bin/kill -s QUIT \$MAINPID
Type=notify
User=redis
Group=redis
RuntimeDirectory=redis
RuntimeDirectoryMode=0755
LimitNOFILE=1000000
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable --now redis &> /dev/null
if [ $? -eq 0 ];then
color "Redis 服务启动成功,Redis信息如下:" 0
else
color "Redis 启动失败" 1
exit
fi
sleep 2
redis-cli -a $PASSWORD INFO Server 2> /dev/null
}
prepare
install
二、集群扩容
新增加两台机器一主一从，10.0.0.202，10.0.0.203
1、在202，203机器上准备好环境
bash install_redis.sh
sed -i.bak \
-e '/masterauth/a masterauth 123456' \
-e '/# cluster-enabled yes/a cluster-enabled yes' \
-e '/# cluster-config-file nodes-6379.conf/a cluster-config-file nodes-6379.conf' \
-e '/cluster-require-full-coverage yes/a cluster-require-full-coverage no' \
/apps/redis/etc/redis.conf
systemctl enable --now redis
systemctl restart redis
2、将新主机10.0.0.202加入集群
redis-cli -a 123456 --cluster add-node 10.0.0.202:6379 10.0.0.150:6379
3、在新的master上重新分配槽位
redis-cli -a 123456 --cluster reshard <当前任意集群节点>:6379
分配槽位说明：How many slots do you want to move (from 1 to 16384)?4096 #新分配多少个槽位
=16384/master个数
What is the receiving node ID? d6e2eca6b338b717923f64866bd31d42e52edc98 #新的
master的ID
Source node #1: all #输入all,将哪些源主机的槽位分配给新的节点，all是自动在所有的redis node选择划分，如果是从redis cluster删除某个主机可以使用此方式将指定主机上的槽位全部移动到别的redis主机
......
Do you want to proceed with the proposed reshard plan (yes/no)? yes #确认分配
4、确认slot分配成功
redis-cli -a 123456 --cluster check 10.0.0.150:6379
5、为新的master202 节点添加一个主机slave203
redis-cli -a 123456 --cluster add-node 10.0.0.203:6379 10.0.0.150:6379 --cluster-slave --cluster-master-id d6e2eca6b338b717923f64866bd31d42e52edc98
6、查看状态
redis-cli -a 123456 -h 10.0.0.150 --no-auth-warning cluster info
三、集群缩容
1、查看当前状态
redis-cli -a 123456 --cluster check 10.0.0.150:6379
2、重新分配槽位
迁移 1365 个 slots 到 150
redis-cli -a 123456 --cluster reshard 10.0.0.150:6379 \
--cluster-from <202-node-id> \
--cluster-to <150-node-id> \
--cluster-slots 1365 \
--cluster-yes
重复此操作直到 202 的 slots = 0。
3、验证202节点已无slots
redis-cli -a 123456 --cluster check 10.0.0.150:6379
4、先删除从节点203
redis-cli -a 123456 -h 10.0.0.203 cluster myid
redis-cli -a 123456 --cluster del-node 10.0.0.150:6379 <203-node-id>
5、再删除主节点202
redis-cli -a 123456 --cluster del-node 10.0.0.150:6379 <202-node-id>
6、验证集群状态
redis-cli -a 123456 --cluster check 10.0.0.150:6379
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