1，创建 redis-cluster
1.1 创建PV
- 此处采用的是静态PV方式，后端使用的是NFS，为了方便扩展可以使用动态PV较好。
- 注：本文档使用 k8s-node01 为 NFS 服务器
[root@k8s-node01 nfs]# mkdir -p redis-cluster/{redis-cluster00,redis-cluster01,redis-cluster02,redis-cluster03,redis-cluster04,redis-cluster05}
[root@k8s-node01 nfs]# more /etc/exports
/nfs/redis-cluster/ 192.168.2.0/24(rw,sync,no_subtree_check,no_root_squash)
1.2 创建namespace
kubectl create namespace public-service
- 注：如果不使用public-service，需要更改所有yaml文件的public-service为你namespace。
sed -i "s#public-service#YOUR_NAMESPACE#g" *.yaml
1.3 创建集群
[root@k8s-master01 redis]# kubectl apply -f k8s-redis-cluster/
configmap/redis-cluster-config created
persistentvolume/pv-redis-cluster-1 created
persistentvolume/pv-redis-cluster-2 created
persistentvolume/pv-redis-cluster-3 created
serviceaccount/redis-cluster created
role.rbac.authorization.k8s.io/redis-cluster created
rolebinding.rbac.authorization.k8s.io/redis-cluster created
service/redis-cluster-ss created
statefulset.apps/redis-cluster-ss created
1.4 查看 pod，pv，pvc
# pv
[root@k8s-master01 k8s-redis-cluster]# kubectl get pv -n public-service
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pv-redis-cluster-0 1Gi RWO Recycle Terminating public-service/redis-cluster-storage-redis-cluster-ss-5 redis-cluster-storage-class 3h40m
pv-redis-cluster-1 1Gi RWO Recycle Terminating public-service/redis-cluster-storage-redis-cluster-ss-0 redis-cluster-storage-class 3h40m
pv-redis-cluster-2 1Gi RWO Recycle Terminating public-service/redis-cluster-storage-redis-cluster-ss-1 redis-cluster-storage-class 3h40m
pv-redis-cluster-3 1Gi RWO Recycle Terminating public-service/redis-cluster-storage-redis-cluster-ss-2 redis-cluster-storage-class 3h40m
pv-redis-cluster-4 1Gi RWO Recycle Terminating public-service/redis-cluster-storage-redis-cluster-ss-3 redis-cluster-storage-class 3h40m
pv-redis-cluster-5 1Gi RWO Recycle Terminating public-service/redis-cluster-storage-redis-cluster-ss-4 redis-cluster-storage-class 3h40m
# pvc
[root@k8s-master01 k8s-redis-cluster]# kubectl get pvc -n public-service
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
redis-cluster-storage-redis-cluster-ss-0 Bound pv-redis-cluster-1 1Gi RWO redis-cluster-storage-class 3h40m
redis-cluster-storage-redis-cluster-ss-1 Bound pv-redis-cluster-2 1Gi RWO redis-cluster-storage-class 3h40m
redis-cluster-storage-redis-cluster-ss-2 Bound pv-redis-cluster-3 1Gi RWO redis-cluster-storage-class 3h40m
redis-cluster-storage-redis-cluster-ss-3 Bound pv-redis-cluster-4 1Gi RWO redis-cluster-storage-class 3h40m
redis-cluster-storage-redis-cluster-ss-4 Bound pv-redis-cluster-5 1Gi RWO redis-cluster-storage-class 3h40m
redis-cluster-storage-redis-cluster-ss-5 Bound pv-redis-cluster-0 1Gi RWO redis-cluster-storage-class 3h40m
# pod
[root@k8s-master01 k8s-redis-cluster]# kubectl get pod -n public-service
NAME READY STATUS RESTARTS AGE
redis-cluster-ss-0 1/1 Running 0 148m
redis-cluster-ss-1 1/1 Running 0 148m
redis-cluster-ss-2 1/1 Running 0 148m
redis-cluster-ss-3 1/1 Running 0 148m
redis-cluster-ss-4 1/1 Running 0 148m
redis-cluster-ss-5 1/1 Running 0 148m
# service
[root@k8s-master01 k8s-redis-cluster]# kubectl get service -n public-service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
redis-cluster-ss ClusterIP None <none> 6379/TCP 149m
- service主要提供pods之间的互访，StatefulSet主要用Headless Service通讯，格式：statefulSetName-{0..N-1}.serviceName.namespace.svc.cluster.local
- serviceName为Headless Service的名字
- 0..N-1为Pod所在的序号，从0开始到N-1
- statefulSetName为StatefulSet的名字
- namespace为服务所在的namespace，Headless Servic和StatefulSet必须在相同的namespace
- .cluster.local为Cluster Domain
- 如本集群的为：
redis-cluster-ss-0.redis-sentinel-master-ss.public-service.svc.cluster.local:6379
1.5 创建slot
v=""
for i in `kubectl get po -n public-service -o wide | grep redis| awk '{print $6}' | grep -v IP`; do v="$v $i:6379";done
kubectl exec -ti redis-cluster-ss-5 -n public-service -- redis-trib.rb create --replicas 1 $v
- 先清空数据，在执行 cluster reset，最后在次执行 创建slot
# 清空数据
for i in `kubectl get po -n public-service -o wide | grep redis| awk '{print $1}' | grep -v IP`; do kubectl exec -it $i -n public-service -- redis-cli -h $i.redis-cluster-ss.public-service.svc.cluster.local flushall;done
# 集群初始化
for i in `kubectl get po -n public-service -o wide | grep redis| awk '{print $1}' | grep -v IP`; do kubectl exec -it $i -n public-service -- redis-cli -h $i.redis-cluster-ss.public-service.svc.cluster.local cluster reset;done
1.6 查看 cluster 信息
# 检查node 节点
[root@k8s-master01 k8s-redis-cluster]# kubectl exec -ti redis-cluster-ss-0 -n public-service -- redis-trib.rb check redis-cluster-ss-0:6379
>>> Performing Cluster Check (using node redis-cluster-ss-0:6379)
M: 8764c6d5a23ad6e6e65883d1cf1d5ca57a99280d redis-cluster-ss-0:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
M: bbe1368773c69879f2045505015a104de5c75780 172.168.1.80:6379
slots:10923-16383 (5461 slots) master
1 additional replica(s)
S: 26b1c1d2c03196d54f4cbac3fb45614fc5f502a0 172.168.1.81:6379
slots: (0 slots) slave
replicates 8764c6d5a23ad6e6e65883d1cf1d5ca57a99280d
M: 4378eea308c543bbf908aba1c92bba341b5e73cd 172.168.0.108:6379
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: a14f10069a791c1c96cdfd74def64ba3f7a0a163 172.168.0.109:6379
slots: (0 slots) slave
replicates bbe1368773c69879f2045505015a104de5c75780
S: 710479f8fe347468073f6776101936f6a1981812 172.168.2.80:6379
slots: (0 slots) slave
replicates 4378eea308c543bbf908aba1c92bba341b5e73cd
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
# 查看node节点
[root@k8s-master01 k8s-redis-cluster]# kubectl exec -ti redis-cluster-ss-0 -n public-service -- redis-cli cluster nodes
bbe1368773c69879f2045505015a104de5c75780 172.168.1.80:6379@16379 master - 0 1544420368969 3 connected 10923-16383
26b1c1d2c03196d54f4cbac3fb45614fc5f502a0 172.168.1.81:6379@16379 slave 8764c6d5a23ad6e6e65883d1cf1d5ca57a99280d 0 1544420368000 5 connected
4378eea308c543bbf908aba1c92bba341b5e73cd 172.168.0.108:6379@16379 master - 0 1544420369971 2 connected 5461-10922
a14f10069a791c1c96cdfd74def64ba3f7a0a163 172.168.0.109:6379@16379 slave bbe1368773c69879f2045505015a104de5c75780 0 1544420368000 4 connected
8764c6d5a23ad6e6e65883d1cf1d5ca57a99280d 172.168.2.79:6379@16379 myself,master - 0 1544420368000 1 connected 0-5460
710479f8fe347468073f6776101936f6a1981812 172.168.2.80:6379@16379 slave 4378eea308c543bbf908aba1c92bba341b5e73cd 0 1544420367000 6 connected
# 查看集群状态信息
[root@k8s-master01 k8s-redis-cluster]# kubectl exec -ti redis-cluster-ss-0 -n public-service -- redis-cli cluster info
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:711
cluster_stats_messages_pong_sent:717
cluster_stats_messages_sent:1428
cluster_stats_messages_ping_received:712
cluster_stats_messages_pong_received:711
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:1428
# 设置key
[root@k8s-master01 k8s-redis-cluster]# kubectl exec -ti redis-cluster-ss-3 -n public-service -- redis-cli -c set test redis-cluster-ss-3
OK
# 查询key
[root@k8s-master01 k8s-redis-cluster]# kubectl exec -ti redis-cluster-ss-3 -n public-service -- redis-cli -c get test
"redis-cluster-ss-3"
[root@k8s-master01 k8s-redis-cluster]# kubectl exec -ti redis-cluster-ss-4 -n public-service -- redis-cli -c get test
"redis-cluster-ss-3"
2，创建 redis-sentinel
2.1 创建PV
- 此处采用的是静态PV方式，后端使用的是NFS，为了方便扩展可以使用动态PV较好。
- 注：本文档使用 k8s-node01 为 NFS 服务器
[root@k8s-node01 nfs]# mkdir -p redis-sentinel/{redis-sentinel00,redis-sentinel01,redis-sentinel02}
[root@k8s-node01 nfs]# more /etc/exports
/nfs/redis-sentinel/ 192.168.2.0/24(rw,sync,no_subtree_check,no_root_squash)
2.2 创建namespace
kubectl create namespace public-service
- 注：如果不使用public-service，需要更改所有yaml文件的public-service为你namespace。
sed -i "s#public-service#YOUR_NAMESPACE#g" *.yaml
2.3 创建集群
2.3.1 创建pv，注意Redis的空间大小按需修改
[root@k8s-master01 k8s-redis-sentinel]# kubectl create -f redis-sentinel-pv.yaml
persistentvolume/pv-redis-sentinel-0 created
persistentvolume/pv-redis-sentinel-1 created
persistentvolume/pv-redis-sentinel-2 created
[root@k8s-master01 k8s-redis-sentinel]# kubectl get pv -n public-service
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pv-redis-sentinel-0 4Gi RWX Recycle Bound public-service/redis-sentinel-slave-storage-redis-sentinel-slave-ss-0 redis-sentinel-storage-class 6m15s
pv-redis-sentinel-1 4Gi RWX Recycle Bound public-service/redis-sentinel-slave-storage-redis-sentinel-slave-ss-1 redis-sentinel-storage-class 6m15s
pv-redis-sentinel-2 4Gi RWX Recycle Bound public-service/redis-sentinel-master-storage-redis-sentinel-master-ss-0 redis-sentinel-storage-class
[root@k8s-master01 k8s-redis-sentinel]# kubectl get pvc -n public-service
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
redis-sentinel-master-storage-redis-sentinel-master-ss-0 Bound pv-redis-sentinel-2 4Gi RWX redis-sentinel-storage-class 45s
redis-sentinel-slave-storage-redis-sentinel-slave-ss-0 Bound pv-redis-sentinel-0 4Gi RWX redis-sentinel-storage-class 45s
2.3.2 Redis配置按需修改，默认使用的是rdb存储模式
[root@k8s-master01 k8s-redis-sentinel]# kubectl create -f redis-sentinel-configmap.yaml
configmap/redis-sentinel-config created
[root@k8s-master01 k8s-redis-sentinel]# kubectl get configmap -n public-service
NAME DATA AGE
redis-sentinel-config 3 17s
- 注意：此时configmap中redis-slave.conf的slaveof的master地址为ss里面的Headless Service地址
2.3.3 创建service
- service主要提供pods之间的互访，StatefulSet主要用Headless Service通讯，格式：statefulSetName-{0..N-1}.serviceName.namespace.svc.cluster.local
- serviceName为Headless Service的名字
- 0..N-1为Pod所在的序号，从0开始到N-1
- statefulSetName为StatefulSet的名字
- namespace为服务所在的namespace，Headless Servic和StatefulSet必须在相同的namespace
- .cluster.local为Cluster Domain
- 如本集群的HS为：
- Master：
redis-sentinel-master-ss-0.redis-sentinel-master-ss.public-service.svc.cluster.local:6379
- Slave：
redis-sentinel-slave-ss-0.redis-sentinel-slave-ss.public-service.svc.cluster.local:6379redis-sentinel-slave-ss-1.redis-sentinel-slave-ss.public-service.svc.cluster.local:6379
[root@k8s-master01 k8s-redis-sentinel]# kubectl create -f redis-sentinel-service-master.yaml -f redis-sentinel-service-slave.yaml
service/redis-sentinel-master-ss created
service/redis-sentinel-slave-ss created
[root@k8s-master01 k8s-redis-sentinel]# kubectl get service -n public-service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
redis-sentinel-master-ss ClusterIP None <none> 6379/TCP 19s
redis-sentinel-slave-ss ClusterIP None <none> 6379/TCP 19s
2.3.4 创建StatefulSet
[root@k8s-master01 k8s-redis-sentinel]# kubectl create -f redis-sentinel-rbac.yaml -f redis-sentinel-ss-master.yaml -f redis-sentinel-ss-slave.yaml
serviceaccount/redis-sentinel created
role.rbac.authorization.k8s.io/redis-sentinel created
rolebinding.rbac.authorization.k8s.io/redis-sentinel created
statefulset.apps/redis-sentinel-master-ss created
statefulset.apps/redis-sentinel-slave-ss created
[root@k8s-master01 k8s-redis-sentinel]# kubectl get statefulset -n public-service
NAME DESIRED CURRENT AGE
redis-sentinel-master-ss 1 1 15s
redis-sentinel-slave-ss 2 1 15s
[root@k8s-master01 k8s-redis-sentinel]# kubectl get pods -n public-service
NAME READY STATUS RESTARTS AGE
redis-sentinel-master-ss-0 1/1 Running 0 2m16s
redis-sentinel-slave-ss-0 1/1 Running 0 2m16s
redis-sentinel-slave-ss-1 1/1 Running 0 88s
- 注：此时相当于已经在k8s上创建了Redis的主从模式。
2.4 通讯测试
2.4.1 master连接slave测试
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-master-ss-0 -n public-service -- redis-cli -h redis-sentinel-slave-ss-0.redis-sentinel-slave-ss.public-service.svc.cluster.local ping
PONG
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-master-ss-0 -n public-service -- redis-cli -h redis-sentinel-slave-ss-1.redis-sentinel-slave-ss.public-service.svc.cluster.local ping
PONG
2.4.2 slave连接master测试
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-slave-ss-0 -n public-service -- redis-cli -h redis-sentinel-master-ss-0.redis-sentinel-master-ss.public-service.svc.cluster.local ping
PONG
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-slave-ss-1 -n public-service -- redis-cli -h redis-sentinel-master-ss-0.redis-sentinel-master-ss.public-service.svc.cluster.local ping
PONG
2.4.3 同步状态查看
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-slave-ss-1 -n public-service -- redis-cli -h redis-sentinel-master-ss-0.redis-sentinel-master-ss.public-service.svc.cluster.local info replication
# Replication
role:master
connected_slaves:2
slave0:ip=172.168.2.82,port=6379,state=online,offset=518,lag=1
slave1:ip=172.168.1.82,port=6379,state=online,offset=518,lag=1
master_replid:424948340bbbcf3f10c97ec61ebdecc66c8db096
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:518
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:518
2.4.4 同步测试
# master写入数据
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-slave-ss-1 -n public-service -- redis-cli -h redis-sentinel-master-ss-0.redis-sentinel-master-ss.public-service.svc.cluster.local set test test_data
OK
# master获取数据
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-slave-ss-1 -n public-service -- redis-cli -h redis-sentinel-master-ss-0.redis-sentinel-master-ss.public-service.svc.cluster.local get test
"test_data"
# slave获取数据
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-slave-ss-1 -n public-service -- redis-cli get test
"test_data"
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-slave-ss-1 -n public-service -- redis-cli set k v
(error) READONLY You can't write against a read only replica.
2.4.5 NFS查看数据存储
[root@k8s-node01 redis-sentinel]# tree
.
├── redis-sentinel00
│ ├── dump.rdb
│ └── redis-slave.conf
├── redis-sentinel01
│ ├── dump.rdb
│ └── redis-slave.conf
└── redis-sentinel02
├── dump.rdb
└── redis-master.conf
- 说明：个人认为在k8s上搭建Redis sentinel完全没有意义，经过测试，当master节点宕机后，sentinel选择新的节点当主节点，当原master恢复后，此时无法再次成为集群节点。因为在物理机上部署时，sentinel探测以及更改配置文件都是以IP的形式，集群复制也是以IP的形式，但是在容器中，虽然采用的StatefulSet的Headless Service来建立的主从，但是主从建立后，master、slave、sentinel记录还是解析后的IP，但是pod的IP每次重启都会改变，所有sentinel无法识别宕机后又重新启动的master节点，所以一直无法加入集群，虽然可以通过固定podIP或者使用NodePort的方式来固定，或者通过sentinel获取当前master的IP来修改配置文件，但是个人觉得也是没有必要的，sentinel实现的是高可用Redis主从，检测Redis Master的状态，进行主从切换等操作，但是在k8s中，无论是dc或者ss，都会保证pod以期望的值进行运行，再加上k8s自带的活性检测，当端口不可用或者服务不可用时会自动重启pod或者pod的中的服务，所以当在k8s中建立了Redis主从同步后，相当于已经成为了高可用状态，并且sentinel进行主从切换的时间不一定有k8s重建pod的时间快，所以个人认为在k8s上搭建sentinel没有意义。所以下面搭建sentinel的步骤无需在看
2.5 创建sentinel
[root@k8s-master01 k8s-redis-sentinel]# kubectl create -f redis-sentinel-ss-sentinel.yaml -f redis-sentinel-service-sentinel.yaml
statefulset.apps/redis-sentinel-sentinel-ss created
service/redis-sentinel-sentinel-ss created
[root@k8s-master01 k8s-redis-sentinel]# kubectl get service -n public-service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
redis-sentinel-master-ss ClusterIP None <none> 6379/TCP 13m
redis-sentinel-sentinel-ss ClusterIP None <none> 26379/TCP 31s
redis-sentinel-slave-ss ClusterIP None <none> 6379/TCP 13m
[root@k8s-master01 k8s-redis-sentinel]# kubectl get statefulset -n public-service
NAME DESIRED CURRENT AGE
redis-sentinel-master-ss 1 1 12m
redis-sentinel-sentinel-ss 3 3 48s
redis-sentinel-slave-ss 2 2 12m
[root@k8s-master01 k8s-redis-sentinel]# kubectl get pods -n public-service | grep sentinel
redis-sentinel-master-ss-0 1/1 Running 0 13m
redis-sentinel-sentinel-ss-0 1/1 Running 0 63s
redis-sentinel-sentinel-ss-1 1/1 Running 0 18s
redis-sentinel-sentinel-ss-2 1/1 Running 0 16s
redis-sentinel-slave-ss-0 1/1 Running 0 13m
redis-sentinel-slave-ss-1 1/1 Running 0 12m
2.5.1 查看哨兵状态
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-sentinel-ss-0 -n public-service -- redis-cli -h 127.0.0.1 -p 26379 info Sentinel
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
sentinel_simulate_failure_flags:0
master0:name=mymaster,status=ok,address=172.168.2.81:6379,slaves=2,sentinels=3
2.5.2 查看日志
2.6 容灾测试
2.6.1 查看数据
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-master-ss-0 -n public-service -- redis-cli -h 127.0.0.1 -p 6379 get test
"test_data"
2.6.2 关闭master节点
2.6.3 查看sentinel状态
# pod
[root@k8s-master01 k8s-redis-sentinel]# kubectl get pods -n public-service -o wide| grep sentinel
redis-sentinel-sentinel-ss-0 1/1 Running 0 13m 172.168.0.110 k8s-master01 <none>
redis-sentinel-sentinel-ss-1 1/1 Running 0 12m 172.168.1.83 k8s-node02 <none>
redis-sentinel-sentinel-ss-2 1/1 Running 0 12m 172.168.2.83 k8s-node01 <none>
redis-sentinel-slave-ss-0 1/1 Running 0 25m 172.168.2.82 k8s-node01 <none>
redis-sentinel-slave-ss-1 1/1 Running 0 24m 172.168.1.82 k8s-node02 <none>
# Sentinel
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-sentinel-ss-2 -n public-service -- redis-cli -h 127.0.0.1 -p 26379 info Sentinel
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
sentinel_simulate_failure_flags:0
master0:name=mymaster,status=ok,address=172.168.2.81:6379,slaves=2,sentinels=3
# info
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-slave-ss-0 -n public-service -- redis-cli -h 127.0.0.1 -p 6379 info replication
# Replication
role:slave
master_host:172.168.2.81
master_port:6379
master_link_status:down
master_last_io_seconds_ago:-1
master_sync_in_progress:0
slave_repl_offset:151040
master_link_down_since_seconds:29
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:424948340bbbcf3f10c97ec61ebdecc66c8db096
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:151040
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:151040
[root@k8s-master01 k8s-redis-sentinel]# kubectl exec -ti redis-sentinel-slave-ss-0 -n public-service -- redis-cli -h 127.0.0.1 -p 6379 get test
"test_data"
