redis集群

集群和哨兵

配置

集群

特点

集群负载均衡

热点数据分片都在同一个槽 （1.重新分片 2.槽节点配置从服务器？）

投票选举

容器

start

重启容器ip变化导致配置不对

#!/bin/bash

DIR="$(cd "$(dirname "$0")" && pwd)"
cd $DIR
export LD_LIBRARY_PATH=$DIR:$LD_LIBRARY_PATH


hosts=/etc/hosts
conf=/var/lib/redis/nodes.conf

newip=$(cat $hosts|grep redis-app|awk '{print $1}')
[ "$newip"x != ""x ] || {  echo "hosts里没有找到redis-app的ip,退出" && exit 1; }

ckeckConf(){
    [ -f "$1" ] || { echo "集群配置文件nodes.conf不存在,集群初始化中..."  && return; }
    

    echo "检查nodes.conf文件内容..."
    arr="$(cat $1|grep -E "master|slave"|awk '{print $1}')"
    len=$(echo  "${arr}" | wc -l)
    echo -e "$len条clusterid,如下: \n""${arr}"
    [ "$len" -ne 1 ] || { echo "集群配置文件clusterid数目不对,请到nfs服务器核查node.conf文件,退出" && exit 1; }


    myselfid=$(cat $1 |grep myself|awk '{print $1}')
    [ "$myselfid"x != ""x ] || {  echo "nodes.conf里没有找到myselfid,退出" && exit 1; }
     echo "把新ip写入自身clusterid文件内..."
    echo $newip > $PWD/$myselfid 
    echo "k8s重启后: $myselfid -> $newip";

    for i in ${arr};
    do
        [ -f "./$i" ] || { echo "没有./$i这个目录" && continue; }

        checkip=$(cat ./$i)
        [ "$checkip"x != ""x ] || { echo "clusterid文件内容为空" && continue; }

        echo "执行命令:ping -c1 $checkip"
        $DIR/ping -c1 $checkip
        [ $? -ne 1 ] || { echo "ping $newip 结果返回ip不通" && continue; }

        oldip=$(cat $1 |grep -E "^$i"|awk '{print $2}'|cut -d ":" -f1)
        [ "$oldip"x != ""x ] || { echo "clusterid在nodes.conf里没有搜索到ip,退出" && exit 1; }

        echo "oldip:$oldip =========== newip:$checkip"
        sed -i "s/$oldip/$checkip/g" $1
        [ $? -ne 0 ] || { echo "完成替换,clusterid:$i === ip:$checkip" && continue; }     

    done
    
    echo "配置文件nodes.conf,检查完毕..."
}

echo "$newip 开始检查配置文件nodes.conf"
ckeckConf  $conf

[ "$(which redis-server)"x != ""x ] || { echo "找不到redis-server,退出" && exit 1; }
echo "开始启动服务...."
echo "执行命令:redis-server $1 --cluster-announce-ip $newip"
redis-server $1 --cluster-announce-ip $newip

 .
├──  libcap.so.2
├──  libidn.so.11
├──  ping
└──  start.sh

pod

kubectl -n devops get pods
NAME          READY   STATUS    RESTARTS   AGE
redis-app-0   1/1     Running   0          50m
redis-app-1   1/1     Running   0          50m
redis-app-2   1/1     Running   0          44m
redis-app-3   1/1     Running   0          38m
redis-app-4   1/1     Running   0          38m
redis-app-5   1/1     Running   0          38m

kubectl -n devops exec -it redis-app-2 /bin/bash
kubectl -n devops exec -it redis-app-4 /bin/bash

redis-cli -c -p 6379

svc ClusterIP

两次认证?

cs@debian:~/oss/hexo$ kubectl get svc -n devops
NAME                     TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)              AGE
jenkins                  ClusterIP   121.21.92.146    <none>        8081/TCP,50000/TCP   105d
redis-headless-service   ClusterIP   None             <none>        6379/TCP             13d
redis-service            ClusterIP   121.21.24.33     <none>        6379/TCP             13d
tomcat                   ClusterIP   121.21.191.100   <none>        8082/TCP             105d

cs@debian:~/oss/hexo$ kubectl exec -it redis-app-1 -n devops  /bin/bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl kubectl exec [POD] -- [COMMAND] instead.
.............
root@redis-app-1:/data# redis-cli  -c -h 121.21.24.33 -p 6379
121.21.24.33:6379> auth 123456
OK
121.21.24.33:6379> ping
PONG
121.21.24.33:6379> get test21
-> Redirected to slot [8530] located at 121.21.35.3:6379
(error) NOAUTH Authentication required.  
121.21.35.3:6379> auth 123456
OK
121.21.35.3:6379> get test21
"20220721cs"

traefik deploay 配置 redis

cs@debian:/opt/kubernetes/yaml/k8s/tcp/redis$ redis-cli  -c  -p  6379
127.0.0.1:6379> auth 123456
OK
127.0.0.1:6379> ping
PONG

127.0.0.1 - 192.168.56.103:6379, 192.168.56.101:6379, 192.168.56.102:6379 - [19/Jul/2022:22:10:12 +0800] 200 0, 0, 82

不通超时

根据podip定位集群pod

cs@debian:~/oss/hexo$  kubectl  get pod --field-selector status.podIP=121.21.35.3 -o wide -n devops
NAME          READY   STATUS    RESTARTS   AGE   IP            NODE     NOMINATED NODE   READINESS GATES
redis-app-1   1/1     Running   1          9d    121.21.35.3   node04   <none>           <none>