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redis on kubernetes
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marcel-dempers
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56
storage/redis/kubernetes/readme.md
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56
storage/redis/kubernetes/readme.md
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# Redis on Kubernetes
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Create a cluster with [kind](https://kind.sigs.k8s.io/docs/user/quick-start/)
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```
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kind create cluster --name redis --image kindest/node:v1.18.4
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```
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## Namespace
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```
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kubectl create ns redis
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```
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## Storage Class
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```
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kubectl get storageclass
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NAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION AGE
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standard (default) rancher.io/local-path Delete WaitForFirstConsumer false 84s
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```
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## Deployment: Redis nodes
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```
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cd storage/redis/kubernetes/
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kubectl apply -n redis -f ./redis/redis-configmap.yaml
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kubectl apply -n redis -f ./redis/redis-statefulset.yaml
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kubectl -n redis get pods
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kubectl -n redis get pv
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kubectl -n redis logs redis-0
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kubectl -n redis logs redis-1
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kubectl -n redis logs redis-2
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```
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## Test replication status
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```
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kubectl -n redis exec -it redis-0 sh
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redis-cli
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auth a-very-complex-password-here
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info replication
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```
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## Deployment: Redis Sentinel (3 instances)
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```
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cd storage/redis/kubernetes/
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kubectl apply -n redis -f ./sentinel/sentinel-statefulset.yaml
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kubectl -n redis get pods
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kubectl -n redis get pv
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kubectl -n redis logs sentinel-0
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```
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1842
storage/redis/kubernetes/redis/redis-configmap.yaml
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1842
storage/redis/kubernetes/redis/redis-configmap.yaml
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File diff suppressed because it is too large
Load Diff
85
storage/redis/kubernetes/redis/redis-statefulset.yaml
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85
storage/redis/kubernetes/redis/redis-statefulset.yaml
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apiVersion: apps/v1
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kind: StatefulSet
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metadata:
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name: redis
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spec:
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serviceName: redis
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replicas: 3
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selector:
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matchLabels:
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app: redis
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template:
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metadata:
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labels:
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app: redis
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spec:
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initContainers:
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- name: config
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image: redis:6.0-alpine
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command: [ "sh", "-c" ]
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args:
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- |
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cp /tmp/redis/redis.conf /etc/redis/redis.conf
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echo "finding master..."
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if [ "$(redis-cli -h sentinel -p 5000 ping)" != "PONG" ]; then
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echo "master not found, defaulting to redis-0"
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if [ "$(hostname)" == "redis-0" ]; then
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echo "this is redis-0, not updating config..."
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else
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echo "updating redis.conf..."
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echo "slaveof redis-0.redis.redis.svc.cluster.local 6379" >> /etc/redis/redis.conf
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fi
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else
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echo "sentinel found, finding master"
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MASTER="$(redis-cli -h sentinel -p 5000 sentinel get-master-addr-by-name mymaster | grep -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}')"
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echo "master found : $MASTER, updating redis.conf"
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echo "slaveof $MASTER 6379" >> /etc/redis/redis.conf
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fi
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volumeMounts:
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- name: redis-config
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mountPath: /etc/redis/
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- name: config
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mountPath: /tmp/redis/
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containers:
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- name: redis
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image: redis:6.0-alpine
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command: ["redis-server"]
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args: ["/etc/redis/redis.conf"]
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ports:
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- containerPort: 6379
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name: redis
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volumeMounts:
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- name: data
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mountPath: /data
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- name: redis-config
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mountPath: /etc/redis/
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volumes:
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- name: redis-config
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emptyDir: {}
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- name: config
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configMap:
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name: redis-config
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volumeClaimTemplates:
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- metadata:
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name: data
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spec:
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accessModes: [ "ReadWriteOnce" ]
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storageClassName: "standard"
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resources:
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requests:
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storage: 50Mi
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: redis
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spec:
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clusterIP: None
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ports:
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- port: 6379
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targetPort: 6379
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name: redis
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selector:
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app: redis
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87
storage/redis/kubernetes/sentinel/sentinel-statefulset.yaml
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87
storage/redis/kubernetes/sentinel/sentinel-statefulset.yaml
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apiVersion: apps/v1
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kind: StatefulSet
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metadata:
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name: sentinel
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spec:
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serviceName: sentinel
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replicas: 3
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selector:
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matchLabels:
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app: sentinel
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template:
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metadata:
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labels:
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app: sentinel
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spec:
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initContainers:
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- name: config
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image: redis:6.0-alpine
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command: [ "sh", "-c" ]
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args:
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- |
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REDIS_PASSWORD=a-very-complex-password-here
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nodes=redis-0.redis.redis.svc.cluster.local,redis-1.redis.redis.svc.cluster.local,redis-2.redis.redis.svc.cluster.local
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for i in ${nodes//,/ }
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do
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echo "finding master at $i"
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MASTER=$(redis-cli --no-auth-warning --raw -h $i -a $REDIS_PASSWORD info replication | awk '{print $1}' | grep master_host: | cut -d ":" -f2)
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if [ "$MASTER" == "" ]; then
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echo "no master found"
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MASTER=
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else
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echo "found $MASTER"
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break
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fi
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done
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echo "sentinel monitor mymaster $MASTER 6379 2" >> /tmp/master
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echo "port 5000
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$(cat /tmp/master)
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sentinel down-after-milliseconds mymaster 5000
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sentinel failover-timeout mymaster 60000
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sentinel parallel-syncs mymaster 1
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sentinel auth-pass mymaster $REDIS_PASSWORD
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" > /etc/redis/sentinel.conf
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cat /etc/redis/sentinel.conf
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volumeMounts:
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- name: redis-config
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mountPath: /etc/redis/
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containers:
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- name: sentinel
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image: redis:6.0-alpine
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command: ["redis-sentinel"]
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args: ["/etc/redis/sentinel.conf"]
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ports:
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- containerPort: 5000
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name: sentinel
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volumeMounts:
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- name: redis-config
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mountPath: /etc/redis/
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- name: data
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mountPath: /data
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volumes:
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- name: redis-config
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emptyDir: {}
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volumeClaimTemplates:
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- metadata:
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name: data
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spec:
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accessModes: [ "ReadWriteOnce" ]
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storageClassName: "standard"
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resources:
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requests:
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storage: 50Mi
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: sentinel
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spec:
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clusterIP: None
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ports:
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- port: 5000
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targetPort: 5000
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name: sentinel
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selector:
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app: sentinel
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