三、实战案例之Redis 服务
1.Dockfile文件信息 [root@localhost7C redis]# ll -rwxr-xr-x 1 root root 132 4月 3 13:49 build-command.sh -rw-r--r-- 1 root root 489 4月 3 13:51 Dockerfile -rw-r--r-- 1 root root 1740967 4月 7 2020 redis-4.0.14.tar.gz -rw-r--r-- 1 root root 58783 4月 3 13:44 redis.conf -rwxr-xr-x 1 root root 85 4月 7 2020 run_redis.sh [root@localhost7C redis]# cat Dockerfile #Redis Image FROM harbor.zzhz.com/baseimages/magedu-centos-base:7.6.1810 MAINTAINER zhangshijie "zhangshijie@magedu.net" ADD redis-4.0.14.tar.gz /usr/local/src RUN ln -sv /usr/local/src/redis-4.0.14 /usr/local/redis && cd /usr/local/redis && make && cp src/redis-cli /usr/sbin/ && cp src/redis-server /usr/sbin/ && mkdir -pv /data/redis-data ADD redis.conf /usr/local/redis/redis.conf ADD run_redis.sh /usr/local/redis/run_redis.sh EXPOSE 6379 CMD ["/usr/local/redis/run_redis.sh"] [root@localhost7C redis]# cat run_redis.sh #!/bin/bash /usr/sbin/redis-server /usr/local/redis/redis.conf tail -f /etc/hosts [root@localhost7C redis]# grep -Ev '^[ ]*$|^#' redis.conf bind 0.0.0.0 protected-mode yes port 6379 tcp-backlog 511 timeout 0 tcp-keepalive 300 daemonize yes supervised no pidfile /var/run/redis_6379.pid loglevel notice logfile "" databases 16 always-show-logo yes save 900 1 save 5 1 save 300 10 save 60 10000 stop-writes-on-bgsave-error no rdbcompression yes rdbchecksum yes dbfilename dump.rdb dir /data/redis-data slave-serve-stale-data yes slave-read-only yes repl-diskless-sync no repl-diskless-sync-delay 5 repl-disable-tcp-nodelay no slave-priority 100 requirepass 123456 lazyfree-lazy-eviction no lazyfree-lazy-expire no lazyfree-lazy-server-del no slave-lazy-flush no appendonly no appendfilename "appendonly.aof" appendfsync everysec no-appendfsync-on-rewrite no auto-aof-rewrite-percentage 100 auto-aof-rewrite-min-size 64mb aof-load-truncated yes aof-use-rdb-preamble no lua-time-limit 5000 slowlog-log-slower-than 10000 slowlog-max-len 128 latency-monitor-threshold 0 notify-keyspace-events "" hash-max-ziplist-entries 512 hash-max-ziplist-value 64 list-max-ziplist-size -2 list-compress-depth 0 set-max-intset-entries 512 zset-max-ziplist-entries 128 zset-max-ziplist-value 64 hll-sparse-max-bytes 3000 activerehashing yes client-output-buffer-limit normal 0 0 0 client-output-buffer-limit slave 256mb 64mb 60 client-output-buffer-limit pubsub 32mb 8mb 60 hz 10 aof-rewrite-incremental-fsync yes [root@localhost7C redis]# cat build-command.sh #!/bin/bash TAG=$1 docker build -t harbor.zzhz.com/linux39/redis:${TAG} . sleep 3 docker push harbor.zzhz.com/linux39/redis:${TAG} [root@localhost7C redis]# chmod +x ./*.sh [root@localhost7C redis]# ./build-command.sh v1
2.安装nfs服务器,基于PV和PVC作为后端存储 [root@localhost7B ]# cat /etc/exports /data/k8sdata *(rw,no_root_squash) [root@localhost7B ]# mkdir /data/k8sdata/magedu/redis-datadir-1 [root@localhost7B ]# systemctl restart nfs-server.service #写数据测试 mount -t nfs 192.168.80.110:/data/k8sdata/magedu/redis-datadir-1 /mnt umount /mnt/ [root@localhost7C redis]# tree . ├── pv │ ├── redis-persistentvolumeclaim.yaml │ └── redis-persistentvolume.yaml └── redis.yaml #创建PV/PVC保存数据,实现k8s中运行Redis服务 [root@localhost7C redis]# cat pv/redis-persistentvolume.yaml --- apiVersion: v1 kind: PersistentVolume metadata: name: redis-datadir-pv-1 namespace: magedu spec: capacity: storage: 10Gi accessModes: - ReadWriteOnce nfs: path: /data/k8sdata/magedu/redis-datadir-1 server: 192.168.80.110 [root@localhost7C redis]# cat pv/redis-persistentvolumeclaim.yaml --- apiVersion: v1 kind: PersistentVolumeClaim metadata: name: redis-datadir-pvc-1 namespace: magedu spec: volumeName: redis-datadir-pv-1 accessModes: - ReadWriteOnce resources: requests: storage: 10Gi
3. 清单 [root@localhost7C redis]# cat redis.yaml kind: Deployment #apiVersion: extensions/v1beta1 apiVersion: apps/v1 metadata: labels: app: devops-redis name: deploy-devops-redis namespace: magedu spec: replicas: 1 selector: matchLabels: app: devops-redis template: metadata: labels: app: devops-redis spec: containers: - name: redis-container image: harbor.zzhz.com/linux39/redis:v1 imagePullPolicy: Always volumeMounts: - mountPath: "/data/redis-data/" name: redis-datadir volumes: - name: redis-datadir persistentVolumeClaim: claimName: redis-datadir-pvc-1 --- kind: Service apiVersion: v1 metadata: labels: app: devops-redis name: srv-devops-redis namespace: magedu spec: type: NodePort ports: - name: http port: 6379 targetPort: 6379 nodePort: 36379 selector: app: devops-redis sessionAffinity: ClientIP sessionAffinityConfig: clientIP: timeoutSeconds: 10800
#登录测试
4.部署测试 [root@localhost7C redis]# kubectl apply -f ./ [root@localhost7C redis]# kubectl exec -it -n magedu deploy-devops-redis-7556995d45-cxs58 bash [root@deploy-devops-redis-7556995d45-cxs58 /]# redis-cli -h 127.0.0.1 -p 6379 -a 123456 Warning: Using a password with '-a' option on the command line interface may not be safe. 127.0.0.1:6379> set key1 vv1 OK 127.0.0.1:6379> set key2 v2 OK 127.0.0.1:6379> set key3 v3 OK 127.0.0.1:6379> set key4 v4 OK 127.0.0.1:6379> set key5 v5 OK 127.0.0.1:6379> get key1 "vv1"验证nfs服务器Redis的快照数据: [root@localhost7B ~]# ll /data/k8sdata/magedu/redis-datadir-1/ -rw-r--r-- 1 root root 144 4月 3 14:31 dump.rdb 验证Redis数据高可用: 删除redis的pod,然后重新创建pod验证新生成的pod中是否有之前的数据,可能有丢失数据的几率,取决于是否 开启AOF或者dump数据的功能及设置: [root@localhost7C redis]# kubectl delete -f redis.yaml [root@localhost7C redis]# kubectl get pod -A -o wide NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES kube-system metrics-server-ccccb9bb6-22ssw 1/1 Running 1 5d3h 10.20.6.18 192.168.80.150 <none> <none> kubernetes-dashboard dashboard-metrics-scraper-74bbb59f48-t6jj2 1/1 Running 1 6d4h 10.20.6.19 192.168.80.150 <none> <none> kubernetes-dashboard kubernetes-dashboard-bc4695695-t44sv 1/1 Running 3 5d3h 10.20.6.17 192.168.80.150 <none> <none> magedu deploy-devops-redis-7556995d45-cxs58 1/1 Terminating 0 19m 10.20.5.47 192.168.80.160 <none> <none> [root@localhost7C redis]# kubectl apply -f redis.yaml [root@localhost7C redis]# kubectl exec -it -n magedu deploy-devops-redis-7556995d45-j6v4l bash [root@deploy-devops-redis-7556995d45-j6v4l /]# redis-cli -h 127.0.0.1 -p 6379 -a 123456 Warning: Using a password with '-a' option on the command line interface may not be safe. 127.0.0.1:6379> 127.0.0.1:6379> 127.0.0.1:6379> get key4 "v4"