1.参考文档
https://kubernetes.io/docs/tasks/inject-data-application/environment-variable-expose-pod-information/
https://blog.csdn.net/liuyunshengsir/article/details/88877427
//www.greatytc.com/p/65c4baadf5d9
2.基础环境 (服务器IP：172.17.0.51,52,53)
a.系统版本 CentOS Linux release 7.6.1810 (Core)
b.kubernetes版本
kubernetes-server-linux-amd64(v1.13.1)
kubernetes-node-linux-amd64(v1.13.1)
kubernetes-client-linux-amd64(v1.13.1)
c.Redis 版本 5.0.5
3.安装kubernetes redis cluster集群
说明：
本次搭建使用6个redis节点，3个主节点3个从节点，分别对应6个PV,PVC
Docker镜像使用的是： redis:alpine (docker pull redis:alpine 即可获取)
Redis安装包下载地址：https://redis.io/download
(1)创建NFS存储
创建NFS存储主要是为了给Redis提供稳定的后端存储，当Redis的Pod重启或迁移后，依然能获得原先的数据。通过使用PV为Redis挂载一个远程的NFS存储。
yum install nfs-utils rpcbind 安装NFS包
编辑/etc/exports，增加如下内容：
/jixson/nfs/pv1 *(rw,no_root_squash)
/jixson/nfs/pv2 *(rw,no_root_squash)
/jixson/nfs/pv3 *(rw,no_root_squash)
/jixson/nfs/pv4 *(rw,no_root_squash)
/jixson/nfs/pv5 *(rw,no_root_squash)
/jixson/nfs/pv6 *(rw,no_root_squash)
systemctl enable nfs && systemctl start nfs 启动 NFS
(2)创建PV
apiVersion: v1
kind: PersistentVolume
metadata:
name: redis-pv1
labels:
app: redis-pv1
spec:
capacity:
storage: 300M
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Retain
nfs:
server: 172.17.0.51
path: "/jixson/nfs/pv1"
其中字段name,app,path,分别修改成对应的pv1-pv6
(3)创建PVC
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: redis-pvc1
labels:
app: redis-pvc1
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 300M
selector:
matchLabels:
app: redis-pv1
其中字段name,app,matchLabels，分别修改成对应的pvc1-pcv6,pv1-pv6
(4)创建ConfigMap
解压下载的redis安装包，获取redis.conf模板文件
kubectl create configmap redis-conf --from-file=redis.conf 导入configmap
configmap配置内容如下：
# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: v1
data:
redis.conf: |
# Redis configuration file example.
#
# Note that in order to read the configuration file, Redis must be
# started with the file path as first argument:
#
# ./redis-server /path/to/redis.conf
# Note on units: when memory size is needed, it is possible to specify
# it in the usual form of 1k 5GB 4M and so forth:
#
# 1k => 1000 bytes
# 1kb => 1024 bytes
# 1m => 1000000 bytes
# 1mb => 1024*1024 bytes
# 1g => 1000000000 bytes
# 1gb => 1024*1024*1024 bytes
#
# units are case insensitive so 1GB 1Gb 1gB are all the same.
bind 0.0.0.0
protected-mode no
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 300
supervised no
loglevel notice
logfile /data/redis.log
databases 5
always-show-logo no
#save 900 1
#save 300 10
#save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir /data
replica-serve-stale-data yes
replica-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
replica-priority 100
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
replica-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 yes
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
stream-node-max-bytes 4096
stream-node-max-entries 100
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit replica 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
dynamic-hz yes
aof-rewrite-incremental-fsync yes
rdb-save-incremental-fsync yes
cluster-enabled yes
cluster-node-timeout 5000
cluster-config-file nodes-6379.conf
cluster-announce-ip MY_POD_IP
cluster-announce-port 6379
cluster-announce-bus-port 16379
cluster-require-full-coverage no
kind: ConfigMap
metadata:
creationTimestamp: "2019-07-18T07:28:05Z"
name: redis-conf
namespace: default
resourceVersion: "3060436"
selfLink: /api/v1/namespaces/default/configmaps/redis-conf
uid: 9583956d-a92d-11e9-8a85-44a84226c870
其中cluster-announce-ip MY_POD_IP，MY_POD_IP表示的是运行redis的容器IP，此IP可以在容器启动时自动获取，然后通过变量替换
(5)创建POD yaml文件
apiVersion: v1
kind: Pod
metadata:
name: redis01
namespace: default
labels:
app: cl01-redis
spec:
containers:
- name: redis01
image: redis:alpine
imagePullPolicy: IfNotPresent
command: [ "/bin/sh", "-c" ]
args: [ "cp /usr/local/etc/redis/redis.conf /data/redis.conf;echo 'sed -i \'s/MY_POD_IP/${MY_POD_IP}/g\' /data/redis.conf' > /data/tmp.sh;sh /data/tmp.sh;redis-server /data/redis.conf" ]
env:
- name: MY_POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
ports:
- name: redis
containerPort: 6379
protocol: TCP
- name: cluster
containerPort: 16379
protocol: TCP
resources:
limits:
cpu: 200m
memory: 200Mi
volumeMounts:
- name: redis-conf
mountPath: /usr/local/etc/redis
- name: redis-data
mountPath: /data
volumes:
- name: redis-conf
configMap:
name: redis-conf
defaultMode: 0755
- name: redis-data
persistentVolumeClaim:
claimName: redis-pvc1
dnsPolicy: None
其中，字段name替换为redis的六个节点， redis01-redis06
(6)创建service，用来代理redis集群访问
apiVersion: v1
kind: Service
metadata:
name: redis-svc
namespace: default
labels:
name: redis-svc
spec:
type: NodePort
ports:
- port: 6379
targetPort: 6379
selector:
app: cl01-redis
(7)启动PV,PVC,POD
kubectl apply -f pv/*
kubectl apply -f pvc/*
kubectl apply -f pod/*
获取6个redis节点的IP，kubectl describe pods redis |grep ^IP:
IP: 10.88.84.4
IP: 10.88.69.4
IP: 10.88.84.5
IP: 10.88.69.5
IP: 10.88.84.2
IP: 10.88.69.6
(8)创建redis集群
额外启动一个centos容器，用来创建redis集群
docker run -d -ti centos /bin/bash
登录容器后，安装redis客户端
yum install -y redis
创建集群
redis-cli --cluster create 10.88.84.2:6379 10.88.84.4:6379 10.88.84.5:6379 10.88.69.6:6379 10.88.69.5:6379 10.88.69.4:6379 --cluster-replicas 1
根据提示输入yes，即可完成集群创建
(9)访问redis集群
[root@node4051 test-yaml]# kubectl get service |grep redis-svc
redis-svc NodePort 10.254.220.30 <none> 6379:47744/TCP 18h
此次服务暴露采用的nodeport方式，通过nodeIP：47744即可访问redis集群
