zhangguanzhang's Blog

consul仅当服务发现在k8s无状态部署使用

consul
字数统计: 4.7k阅读时长: 24 min
2019/10/24

由来

consul server 在机器上的部署已经写完了，但是dba还是希望部署在 k8s 上，昨天搜了下相关文章扣出来部分步骤自己验证实现了。
先说下需求，三台物理机单独跑 mysql 主从 mha，利用 consul client 的服务注册+ttl向 consul server 注册成域名，然后配置 k8s 内部的 coredns 把域名*.service.consul转发到 consul server。架构为下图

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Physical server
 +---------------------+                            K8S Cluster
 |                     |                   +--------------------------------+
 |mysql + consul client+-----------+       |     +---------------------+    |
 |                     |           |       |     |    +-------------+  |    |
 +---------------------+           |       |     |    |consul server|  |    |
Physical server                    |       |     | D  +------+------+  |    |
 +---------------------+           |       |     | e         |         |    |
 |                     |           |       |     | p  +------+------+  |    |
 |mysql + consul client+----------->------>+     | l  |consul server|  |    |
 |                     |           |       |     | o  +------+------+  |    |
 +---------------------+           |       |     | y         |         |    |
Physical server                    |       |     |    +------+------+  |    |
 +---------------------+           |       |     |    |consul server|  |    |
 |                     |           |       |     |    +-------------+  |    |
 |mysql + consul client+-----------+       |     +---------------------+    |
 |                     |                   +--------------------------------+
 +---------------------+

然后 k8s 集群里跑 maxscale，集群里服务连 maxscale，maxscale 通过俩域名连 mysql
consul 有 k8s client 的相关代码，赋予 RBAC 后能够用 selector 能够自动join到其他成员

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...
        "retry_join": [
            "provider=k8s label_selector=\"app=consul,component=server\""
        ],

当然其实市面上还有其他的方案的，为啥我不用

环境信息为下

IP role nodeName
172.19.0.5 k8s+server 172.19.0.5
172.19.0.6 k8s+server 172.19.0.6
172.19.0.7 k8s+server 172.19.0.7
172.19.0.11 client 172.19.0.11
172.19.0.12 client 172.19.0.12
172.19.0.13 client 172.19.0.13

镜像准备

因为这里我是 consul server 跑 k8s 里，consul client 在物理机上，通信我要配置成 tls，tls我是 secret 导入的，cm写配置文件。挂载到 pod 里后因为官方 docker 镜像的entrypoint.sh里 chown 了配置文件目录，而挂载到 pod 内部是只读的，pod 起来后执行到 chown 那就报错退出了。所以改造了下官方的 entrypoint 脚本

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FROM consul:1.6.1
LABEL maintainer="zhangguanzhang <zhangguanzhang@qq.com>"

ARG TZ=Asia/Shanghai

RUN set -eux && \
    ln -sf /usr/share/zoneinfo/${TZ} /etc/localtime && \
    echo ${TZ} > /etc/timezone
COPY docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh

docker-entrypoint.sh见我 github https://raw.githubusercontent.com/zhangguanzhang/Dockerfile/master/consul-k8s-dns/docker-entrypoint.sh
Dockerfile 我是打算直接改官方的而不是FROM镜像，但是 gpg key 出问题所以我写成上面那样构建的镜像。见issue https://github.com/hashicorp/docker-consul/issues/137
自己构建镜像的话docker-entrypoint.sh记得加执行权限，我构建的镜像推送到 dockerhub 上可以直接拉取

tls

证书操作都是在容器里生成的

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mkdir -p consul/ssl
cd consul
docker run --rm -ti --entrypoint sh \
  --workdir /root -v $PWD/ssl:/root/ zhangguanzhang/consul-k8s-dns:1.6.1

我们先进入容器

step 1: 创建ca

为了简单起见，这里我使用 Consul 命令行的的内置 TLS 功能来创建基本的 CA。您只需为数据中心创建一个 CA。您应该在用于创建CA的同一服务器上生成所有证书。
ca默认五年，其他的证书默认1年，这里需要带参数 -days= 设置长点的日期

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consul tls ca create -days=36500
==> Saved consul-agent-ca.pem
==> Saved consul-agent-ca-key.pem

step2: 创建server角色的证书

这里数据中心默认名字为 dc1，其他的自行选项赋值。在创建 CA 的同一台服务器上重复此过程，直到每台服务器都有一个单独的证书。该命令可以反复调用，它将自动增加证书和密钥号。您将需要将证书分发到服务器。
严格来说每个 server 单独使用，也就是说假如三个 server，下面命令应该执行三次。但是我们仅仅当无状态服务使用，如果每个 server 单独一套证书就不能放 secret 里，毕竟文件名不一样不能对照到pod上，这里我们仅仅生成一份

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consul tls cert create -server -dc=dc1 -days=36500
==> WARNING: Server Certificates grants authority to become a
    server and access all state in the cluster including root keys
    and all ACL tokens. Do not distribute them to production hosts
    that are not server nodes. Store them as securely as CA keys.
==> Using consul-agent-ca.pem and consul-agent-ca-key.pem
==> Saved dc1-server-consul-0.pem
==> Saved dc1-server-consul-0-key.pem

step3: 创建client角色的证书

在Consul 1.5.2 中，您可以使用替代过程来自动将证书分发给客户端。要启用此新功能，请设置auto_encrypt。

您可以继续使用生成证书consul tls cert create -client并手动分发证书。对于需要高度保护的数据中心，仍然需要现有的工作流程。

如果您正在运行Consul 1.5.1或更早版本，则需要使用来为每个客户端创建单独的证书consul tls cert create -client。客户端证书也由您的CA签名，但是它们没有特殊性Subject Alternative Name，这意味着如果verify_server_hostname启用，则它们不能作为server角色启动。

这里我是高于1.5.2的，不需要为每个客户端创建证书，客户端只需要拥有consul-agent-ca.pem这个ca下，会自动从server获取证书存在内存中，并且不会持久保存。但是我测试了并没有成功，还是生成了证书。
实际是三个consul client，所以下面命令得执行三次

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$ consul tls cert create -client -dc=dc1 -days=36500
==> Using consul-agent-ca.pem and consul-agent-ca-key.pem
==> Saved dc1-client-consul-0.pem
==> Saved dc1-client-consul-0-key.pem
$ consul tls cert create -client -dc=dc1 -days=36500
==> Using consul-agent-ca.pem and consul-agent-ca-key.pem
==> Saved dc1-client-consul-1.pem
==> Saved dc1-client-consul-1-key.pem
$ consul tls cert create -client -dc=dc1 -days=36500
==> Using consul-agent-ca.pem and consul-agent-ca-key.pem
==> Saved dc1-client-consul-2.pem
==> Saved dc1-client-consul-2-key.pem

客户端实体服务跑，可以单独去生成而不是共用一套(理论上也可以一套，可以自行去尝试)

step4: 创建cli的证书

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$ consul tls cert create -cli -dc=dc1 -days=36500
==> Using consul-agent-ca.pem and consul-agent-ca-key.pem
==> Saved dc1-cli-consul-0.pem
==> Saved dc1-cli-consul-0-key.pem

创建完证书ctrl+d退出容器

step5: 检查证书情况

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$ ls -l ssl
total 40
-rw-r--r-- 1 root root  227 Mar  8 13:47 consul-agent-ca-key.pem
-rw-r--r-- 1 root root 1253 Mar  8 13:47 consul-agent-ca.pem
-rw-r--r-- 1 root root  227 Mar  8 13:50 dc1-cli-consul-0-key.pem
-rw-r--r-- 1 root root 1082 Mar  8 13:50 dc1-cli-consul-0.pem
-rw-r--r-- 1 root root  227 Mar  8 13:48 dc1-client-consul-0-key.pem
-rw-r--r-- 1 root root 1143 Mar  8 13:48 dc1-client-consul-0.pem
-rw-r--r-- 1 root root  227 Mar  8 13:49 dc1-client-consul-1-key.pem
-rw-r--r-- 1 root root 1143 Mar  8 13:49 dc1-client-consul-1.pem
-rw-r--r-- 1 root root  227 Mar  8 13:49 dc1-client-consul-2-key.pem
-rw-r--r-- 1 root root 1143 Mar  8 13:49 dc1-client-consul-2.pem
-rw-r--r-- 1 root root  227 Mar  8 13:47 dc1-server-consul-0-key.pem
-rw-r--r-- 1 root root 1143 Mar  8 13:47 dc1-server-consul-0.pem

consul deploy

consul可以跨数据中心，wan 相关配置(hostPort模拟)我测试没有成功，而且考虑到高可用，基本是每台机器一台。所以我用了硬性互斥+hostNetwork，关闭 serfwan 端口。

apply之前我们先把证书导入成secret

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cd ssl
kubectl create secret generic consul \
  --from-file=consul-agent-ca.pem \
  --from-file=dc1-server-consul-0.pem \
  --from-file=dc1-server-consul-0-key.pem \
  --from-file=dc1-cli-consul-0.pem \
  --from-file=dc1-cli-consul-0-key.pem

server部分 – on k8s

另外要注意

  • 因为每次 pod 重启基本相当于 node-id 变了，参数 leave_on_terminate 应该 false，见 https://github.com/hashicorp/consul/issues/6672 和 https://github.com/hashicorp/consul/issues/3938 所以 preStop 的部分没啥用，忽略即可
    因为 coredns 的转发需要写 ip 或者文件而不能是域名，所以我们得把 consul-server 的 svc 的 clusterIP 给固定住(记住得在svc的 cidr 内选一个未使用的ip)，或者干脆不创建svc直接使用 hostIP，这里按照svc实例
  • disable_host_node_id应该设置为 false，hostNetowkr下pod的hostname是宿主机的，这个选项默认值为true，会随机每次的node-id导致刷错误日志2020/04/21 04:07:16 [WARN] consul.fsm: EnsureRegistration failed: failed inserting node: Error while renaming Node ID: "6e68f174-1e65-b660-b407-51b7d9a4e22d": Node name 100.64.24.3 is reserved by node 7a9ab787-3593-52c2-81c1-87cf65fabbcf with name 100.64.24.3 (100.64.24.3)

master也是k8s的node，如果你总共有三个以上的node，nodeSelector记得自己去打label固定住，如果是只有三台(master+node合一)则取消下面yaml的nodeSelector属性

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apiVersion: apps/v1
kind: Deployment
metadata:
  name: consul-server
spec:
  selector:
    matchLabels:
      app: consul
      component: server
  replicas: 3
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 1
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: consul
        component: server
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: app
                    operator: In
                    values:
                      - consul
              topologyKey: kubernetes.io/hostname
      serviceAccountName: consul-server
      nodeSelector:
        master: "true" # 如果单独三台master+node就不用nodeSelector
      terminationGracePeriodSeconds: 7
      hostNetwork: true
      securityContext:
        fsGroup: 1000
      # imagePullSecrets:
      #   - name: harbor-local
      containers:
        - name: consul
          image: zhangguanzhang/consul-k8s-dns:1.6.1
          env:
            - name: POD_IP
              valueFrom:
                fieldRef:
                  fieldPath: status.podIP
            - name: NODE
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: CONSUL_HTTP_ADDR
              value: https://localhost:8501
            - name: CONSUL_CACERT
              value: /consul/config/ssl/consul-agent-ca.pem
            - name: CONSUL_CLIENT_CERT
              value: /consul/config/ssl/dc1-cli-consul-0.pem
            - name: CONSUL_CLIENT_KEY
              value: /consul/config/ssl/dc1-cli-consul-0-key.pem
            # - name: RETRY_JOIN
            #   value: 172.19.0.5,172.19.0.6,172.19.0.7
          args:
            - agent
            - -advertise=$(POD_IP)
            - -node=$(NODE)
          volumeMounts:
            - name: localtime
              mountPath: /etc/localtime
            - name: data
              mountPath: /consul/data
            - name: config
              mountPath: /consul/config/
            - name: tls
              mountPath: /consul/config/ssl/
          lifecycle:
            preStop:
              exec:
                command:
                - consul leave
          readinessProbe:
            exec:
              command:
                - consul
                - members
            failureThreshold: 2
            initialDelaySeconds: 10
            periodSeconds: 5
            successThreshold: 1
            timeoutSeconds: 3
          ports:
            - containerPort: 8300
              name: server
            - containerPort: 8301
              name: serflan
            # - containerPort: 8302
            #   name: serfwan
            - containerPort: 8400
              name: alt-port
            - containerPort: 8501
              name: https
            - containerPort: 8600
              name: dns-udp
              protocol: UDP
            - containerPort: 8600
              name: dns-tcp
              protocol: TCP
      volumes:
        - name: config
          configMap:
            name: consul-server
        - name: tls
          secret:
            secretName: consul
        - name: localtime
          hostPath:
            path: /etc/localtime
        - name: data
          emptyDir: {}
---
apiVersion: v1
kind: Service
metadata:
  name: consul-server
  namespace: default
  labels:
    app: consul
spec:
  clusterIP: 10.96.0.11
  ports:
    - name: https
      port: 8501
      targetPort: https
    - name: serflan-tcp
      protocol: "TCP"
      port: 8301
      targetPort: 8301
    - name: serflan-udp
      protocol: "UDP"
      port: 8301
      targetPort: 8301
    # - name: serfwan-tcp
    #   protocol: "TCP"
    #   port: 8302
    #   targetPort: 8302
    # - name: serfwan-udp
    #   protocol: "UDP"
    #   port: 8302
    #   targetPort: 8302
    - name: server
      port: 8300
      targetPort: 8300
    - name: dns-tcp
      protocol: "TCP"
      port: 8600
      targetPort: dns-tcp
    - name: dns-udp
      protocol: "UDP"
      port: 8600
      targetPort: dns-udp
  selector:
    app: consul
    component: server
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: consul-server
  namespace: default
  labels:
    app: consul
    role: server
data:
  server.json: |-
    {
        "client_addr": "0.0.0.0",
        "datacenter": "dc1",
        "bootstrap_expect": 3,
        "domain": "consul",
        "skip_leave_on_interrupt": true,
        "leave_on_terminate" : false,
        "log_level": "INFO",
        "retry_join": [
            "provider=k8s label_selector=\"app=consul,component=server\""
        ],
        "retry_interval": "2s",
        "verify_incoming": true,
        "verify_outgoing": true,
        "verify_server_hostname": true,
        "ca_file": "/consul/config/ssl/consul-agent-ca.pem",
        "cert_file": "/consul/config/ssl/dc1-server-consul-0.pem",
        "key_file": "/consul/config/ssl/dc1-server-consul-0-key.pem",
        "disable_host_node_id": false,
        "ports": {
          "http": -1,
          "serf_wan": -1,
          "https": 8501
        },
        "server": true,
        "ui": false
    }
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: consul-server
  labels:
    app: consul
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: consul
  labels:
    app: consul
rules:
  - apiGroups: [""]
    resources:
      - pods
    verbs:
      - get
      - list
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: consul
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: consul
subjects:
  - kind: ServiceAccount
    name: consul-server
    namespace: default

确保nodeSelector符合自身环境后就 apply

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$ kubectl get pod -o wide -l app=consul
NAME                             READY   STATUS    RESTARTS   AGE     IP           NODE         NOMINATED NODE   READINESS GATES
consul-server-7879498d78-8qjbs   1/1     Running   0          2m34s   172.19.0.6   172.19.0.6   <none>           <none>
consul-server-7879498d78-drm7n   1/1     Running   0          2m34s   172.19.0.7   172.19.0.7   <none>           <none>
consul-server-7879498d78-zjc6z   1/1     Running   0          2m34s   172.19.0.5   172.19.0.5   <none>           <none>

client部分

client是实体服务，用我的ansible部署的

下载ansible部署文件

没有安装 ansible 的话自行去我下面的git的 readme 安装下 ansible ，在 consul 目录下 clone

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cd ..
git clone https://github.com/zhangguanzhang/consul-tls-ansible
mv consul-tls-ansible/* ssl/
rm -rf consul-tls-ansible
cd ssl
docker run --rm -tid --name tempconsul zhangguanzhang/consul-k8s-dns:1.6.1 sleep 20
docker cp tempconsul:/bin/consul .

自行配制下inventory/hosts，这里不用我剧本的其他role，server段写ip即可，主要用来渲染 client 去 join 哪里。这里的 mysql 物理机同事已经设置好了 hostname 和基础参数，所以client里的hostname=xxx得删掉，最后为如下

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$ cat inventory/hosts
[server]
172.19.0.5
172.19.0.6
172.19.0.7
[client]
172.19.0.11 clusterName=172.19.0.11
172.19.0.12 clusterName=172.19.0.12
172.19.0.13 clusterName=172.19.0.13

还有在group_vars/all.yml里改下ansible的ssh密码
配置完测下连同性

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ansible client -m ping

部署client

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ansible-playbook 04-client.yml
# 删掉剧本目录的consul二进制文件
rm -f consul

在client机器上查看members

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$ consul members
Node         Address           Status  Type    Build  Protocol  DC   Segment
172.19.0.5   172.19.0.5:8301   alive   server  1.6.1  2         dc1  <all>
172.19.0.6   172.19.0.6:8301   alive   server  1.6.1  2         dc1  <all>
172.19.0.7   172.19.0.7:8301   alive   server  1.6.1  2         dc1  <all>
172.19.0.11  172.19.0.11:8301  alive   client  1.6.1  2         dc1  <default>
172.19.0.12  172.19.0.12:8301  alive   client  1.6.1  2         dc1  <default>
172.19.0.13  172.19.0.13:8301  alive   client  1.6.1  2         dc1  <default>

同样的，我们也可以在pod里查看

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$ kubectl exec consul-server-7879498d78-8qjbs consul members
Node         Address           Status  Type    Build  Protocol  DC   Segment
172.19.0.5   172.19.0.5:8301   alive   server  1.6.1  2         dc1  <all>
172.19.0.6   172.19.0.6:8301   alive   server  1.6.1  2         dc1  <all>
172.19.0.7   172.19.0.7:8301   alive   server  1.6.1  2         dc1  <all>
172.19.0.11  172.19.0.11:8301  alive   client  1.6.1  2         dc1  <default>
172.19.0.12  172.19.0.12:8301  alive   client  1.6.1  2         dc1  <default>
172.19.0.13  172.19.0.13:8301  alive   client  1.6.1  2         dc1  <default>

配置服务发现

client配置服务注册，我剧本都是规范目录和子配置文件，服务发现在/etc/consul.d/client/下写json文件即可，这里我在172.19.0.11上做个实例

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{
  "services": [
    {
      "name": "r-3306-mysql",
      "tags": [
        "slave-3306"
      ],
      "address": "172.19.0.11",
      "port": 3306,
      "checks": [
        {
          "args": ["echo"], //实际应该写健康检查脚本,并去掉此处注释
          "interval": "5s"
        }
      ]
    }
  ]
}

然后重启下consul

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systemctl restart consul

会看到服务注册上去

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2019/10/24 13:32:12 [INFO] agent: (LAN) joined: 3
2019/10/24 13:32:12 [INFO] agent: Join LAN completed. Synced with 3 initial agents
2019/10/24 13:32:12 [INFO] agent: Synced service "r-3306-mysql"
2019/10/24 13:32:21 [INFO] agent: Synced check "service:r-3306-mysql"

测试解析，记得安装bind-utils

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$ dig -p 8600 @172.19.0.11 r-3306-mysql.service.consul +short
172.19.0.11
$ dig -p 8600 @172.19.0.5 r-3306-mysql.service.consul +short
172.19.0.11

配置k8s域名解析转发

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$ kubectl get svc
NAME            TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)                                                 AGE
consul-server   ClusterIP   10.96.0.11   <none>        8501/TCP,8301/TCP,8301/UDP,8300/TCP,8600/TCP,8600/UDP   2m48s
kubernetes      ClusterIP   10.96.0.1    <none>        443/TCP                                                 2d22h

在k8s的node上直接使用svc来测试域名解析

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$ dig -p 8600 @10.96.0.11 r-3306-mysql.service.consul +short
172.19.0.11

配置coredns转发，coredns的configmap添加下面内容，也可以添加上client的ip，切记ip不要和我一样，自行按照自己的ip填写
kubectl -n kube-system edit cm coredns

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...
    } # 下面行开始复制
    service.consul:53 {
        errors
        cache 1
        forward . 10.96.0.11:8600 172.19.0.11:8600 172.19.0.12:8600 172.19.0.13:8600 {
          max_fails 1
        }
    }

跑一个指定版本带解析的工具pod，也可以用dig @10.96.0.10 +short w-3306-mysql.service.consul

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$ cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: busybox
  namespace: default
spec:
  containers:
  - name: busybox
    image: library/busybox:1.28
    command:
      - sleep
      - "3600"
    imagePullPolicy: IfNotPresent
  restartPolicy: Always
EOF

等上面的pod就绪后来测试解析，不影响集群的内部解析

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$ kubectl exec -ti busybox -- nslookup r-3306-mysql.service.consul
Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

Name:      r-3306-mysql.service.consul
Address 1: 172.19.0.11
$ kubectl exec -ti busybox -- nslookup kubernetes
Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

Name:      kubernetes
Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local

maxscale

这里maxscale是集群里运行，dba要求日志直接挂载在宿主机(所以去掉cmd的-l stdout)，因为maxscale不允许root运行，且容器里 maxscale 的用户的 uid 为999，所以现在是三台node上创建/var/log/maxscale/后chown 999:999它
然后下面是yaml，密码部分打码。更改了下官方的 Dockerfile 增加了个 curl 和 jq ，可能后期存活检查用 curl 走r est api 做。下面的svc如果有需要向外暴露的话可以自己nodeport

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apiVersion: apps/v1
kind: Deployment
metadata:
  name: maxscale
spec:
  selector:
    matchLabels:
      app: maxscale
      component: production
  replicas: 3
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 1
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: maxscale
        component: production
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: app
                    operator: In
                    values:
                      - maxscale
              topologyKey: kubernetes.io/hostname
      terminationGracePeriodSeconds: 5
      securityContext:
        fsGroup: 999
      # imagePullSecrets:
      #   - name: harbor-local
      containers:
        - name: maxscale
          image: zhangguanzhang/maxscale:2.4.7
          args:
            - maxscale
            - -d
            - -U
            - maxscale
            - -f
            - /etc/maxscale/maxscale.cnf
          volumeMounts:
            - name: localtime
              mountPath: /etc/localtime
            - name: log
              mountPath: /var/log/maxscale
            - name: maxscale-cnf
              mountPath: /etc/maxscale
          livenessProbe:
            failureThreshold: 3
            initialDelaySeconds: 3
            periodSeconds: 3
            successThreshold: 1
            tcpSocket:
              port: mysql
            timeoutSeconds: 1
          readinessProbe:
            failureThreshold: 3
            initialDelaySeconds: 3
            periodSeconds: 3
            successThreshold: 1
            tcpSocket:
              port: mysql
            timeoutSeconds: 1
          ports:
            - name: mysql
              containerPort: 3306
            # - name: rest-api
            #   containerPort: 8989
          resources:
            limits:
              cpu: "8"
              memory: 2Gi
            requests:
              cpu: "2"
              memory: 500Mi
      volumes:
        - name: localtime
          hostPath:
            path: /etc/localtime
        - name: log
          hostPath:
            path: /var/log/maxscale
        - name: maxscale-cnf
          configMap:
            name: maxscale-config
            defaultMode: 420
---
apiVersion: v1
kind: Service
metadata:
  name: mysql-service
  namespace: default
  labels:
    app: mysql-service
spec:
  ports:
    - name: mysql
      port: 3306
      targetPort: mysql
    # - name: rest-api
    #   port: 8989
    #   targetPort: rest-api
  selector:
    app: maxscale
    component: production
---
# apiVersion: v1
# kind: Service
# metadata:
#   name: uca-mysql
#   namespace: default
#   labels:
#     app: mysql-service
# spec:
#   type: NodePort
#   ports:
#     - name: mysql
#       port: 3306
#       nodePort: 3306
#       targetPort: mysql
#     # - name: rest-api
#     #   port: 8989
#     #   targetPort: rest-api
#   selector:
#     app: maxscale
#     component: production
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: maxscale-config
  namespace: default
  labels:
    app: maxscale
    role: production
data:
  maxscale.cnf: |-
    # MaxScale documentation on GitHub:
    # https://github.com/mariadb-corporation/MaxScale/blob/master/Documentation/Documentation-Contents.md
    # Global parameters
    #
    # Complete list of configuration options:
    # https://github.com/mariadb-corporation/MaxScale/blob/master/Documentation/Getting-Started/Configuration-Guide.md
    [maxscale]
    threads=16
    ms_timestamp=1
    syslog=0
    maxlog=1
    log_warning=1
    log_notice=1
    log_info=0
    log_debug=0
    log_augmentation=1

    users_refresh_time=1

    #logdir=/data/maxscale/log/
    #datadir=/data/maxscale/data/
    #cachedir=/data/maxscale/cache/
    #piddir=/data/maxscale/pid/


    [server1]
    type=server
    address=w-3306-mysql.service.consul
    port=3306
    protocol=MySQLBackend

    [server2]
    type=server
    address=r-3306-mysql.service.consul
    port=3306
    protocol=MySQLBackend


    [MySQL-Monitor]
    type=monitor
    module=mysqlmon
    servers=server1,server2
    user=maxscale
    password=******
    monitor_interval=10000

    [Read-Write-Service]
    type=service
    router=readwritesplit
    servers=server1,server2
    user=maxscale
    password=******
    max_slave_connections=100%

    [MaxAdmin-Service]
    type=service
    router=cli

    [Read-Write-Listener]
    type=listener
    service=Read-Write-Service
    protocol=MySQLClient
    port=3306

    [MaxAdmin-Listener]
    type=listener
    service=MaxAdmin-Service
    protocol=maxscaled
    socket=default
---

密码已经打码

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$ kubectl get pod -o wide -l app=maxscale
maxscale-645864d9cb-dcx77                             1/1     Running   0          67s     10.244.0.38   172.19.0.2   <none>           <none>
$ kubectl exec maxscale-645864d9cb-dcx77 maxadmin list servers
Servers.
-------------------+-----------------+-------+-------------+--------------------
Server             | Address         | Port  | Connections | Status              
-------------------+-----------------+-------+-------------+--------------------
server1            | w-3306-mysql.service.consul |  3306 |           0 | Master, Running
server2            | r-3306-mysql.service.consul |  3306 |           0 | Slave, Running
-------------------+-----------------+-------+-------------+--------------------
$ kubectl get svc -l app=mysql-service
NAME            TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
mysql-service   ClusterIP   10.105.107.173   <none>        3306/TCP   10m

测试下连接性，下面我是宿主机上安装mysql的客户端测试的

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$ mysql -u moove -p -h 10.105.107.173
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 77
Server version: 5.7.26-log MySQL Community Server (GPL)

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

清理和备份

把consul目录打包并分别发到server或者client的机器上，三份不可能同时坏掉

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$ kubectl delete pod busybox
$ tar zcf consul-deploy.tar.gz consul/

自行把备份拷贝，这里我是拷贝到client的机器上

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cd consul/ssl
ansible client -m file -a 'name=/opt/consul/ state=directory'
ansible client -m copy -a 'src=../../consul-deploy.tar.gz dest=/opt/consul/'

参考

https://www.consul.io/docs/platform/k8s/run.html
https://github.com/kelseyhightower/consul-on-kubernetes
https://hub.helm.sh/charts/appuio/maxscale

原文作者：Zhangguanzhang

原文链接：http://zhangguanzhang.github.io/2019/10/24/deployment-consul-in-k8s/

发表日期：October 24th 2019, 10:17:53 am

更新日期：October 24th 2019, 10:17:53 am

版权声明：本文采用知识共享署名-非商业性使用 4.0 国际许可协议进行许可

CATALOG
  1. 1. 由来
  2. 2. 镜像准备
  3. 3. tls
    1. 3.1. step 1: 创建ca
    2. 3.2. step2: 创建server角色的证书
    3. 3.3. step3: 创建client角色的证书
    4. 3.4. step4: 创建cli的证书
    5. 3.5. step5: 检查证书情况
  4. 4. consul deploy
    1. 4.1. server部分 – on k8s
    2. 4.2. client部分
      1. 4.2.1. 下载ansible部署文件
      2. 4.2.2. 部署client
      3. 4.2.3. 配置服务发现
    3. 4.3. 配置k8s域名解析转发
  5. 5. maxscale
  6. 6. 清理和备份
  7. 7. 参考
Total : 186
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