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使用示例
最后,让我们进入实战模式,这里跑一个最简单的单机示例(所有组件运行在一台机器上),旨在打通基本流程。
搭建环境
第一步,我们需要Kuberntes各组件的二进制可执行文件。有以下两种方式获取:
- git clone https://github.com/GoogleCloudPlatform/kubernetes.git
- cd kubernetes/build
- ./release.sh
- wget https://storage.googleapis.com/kubernetes/binaries.tar.gz
自己编译源码需要先安装好golang,编译完之后在kubernetes/_output/release-tars文件夹下可以得到打包文件。直接下载的方式不需要安装其他软件,但可能得不到最新的版本。 第二步,我们还需要etcd的二进制可执行文件,通过如下方式获取:
- wget https://github.com/coreos/etcd/releases/download/v0.4.6/etcd-v0.4.6-linux-amd64.tar.gz
- tar xvf etcd-v0.4.6-linux-amd64.tar.gz
第三步,就可以启动各个组件了:etcd
- cd etcd-v0.4.6-linux-amd64
- ./etcd
apiserver
- ./apiserver \
- -address=127.0.0.1 \
- -port=8080 \
- -portal_net="172.0.0.0/16" \
- -etcd_servers=http://127.0.0.1:4001 \
- -machines=127.0.0.1 \
- -v=3 \
- -logtostderr=false \
- -log_dir=./log
scheduler
- ./scheduler -master 127.0.0.1:8080 \
- -v=3 \
- -logtostderr=false \
- -log_dir=./log
controller-manager
- ./controller-manager -master 127.0.0.1:8080 \
- -v=3 \
- -logtostderr=false \
- -log_dir=./log
kubelet
- ./kubelet \
- -address=127.0.0.1 \
- -port=10250 \
- -hostname_override=127.0.0.1 \
- -etcd_servers=http://127.0.0.1:4001 \
- -v=3 \
- -logtostderr=false \
- -log_dir=./log
创建pod
搭好了运行环境后,就可以提交pod了。首先编写pod描述文件,保存为redis.json:
- {
- "id": "redis",
- "desiredState": {
- "manifest": {
- "version": "v1beta1",
- "id": "redis",
- "containers": [{
- "name": "redis",
- "image": "dockerfile/redis",
- "imagePullPolicy": "PullIfNotPresent",
- "ports": [{
- "containerPort": 6379,
- "hostPort": 6379
- }]
- }]
- }
- },
- "labels": {
- "name": "redis"
- }
- }
然后,通过命令行工具kubecfg提交:
- ./kubecfg -c redis.json create /pods
提交完后,通过kubecfg查看pod状态:
- # ./kubecfg list /pods
- ID Image(s) Host Labels Status
- ---------- ---------- ---------- ---------- ----------
- redis dockerfile/redis 127.0.0.1/ name=redis Running
Status是Running表示pod已经在容器里运行起来了,可以用"docker ps"命令来查看容器信息:
- # docker ps
- CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
- ae83d1e4b1ec dockerfile/redis:latest "redis-server /etc/r 19 seconds ago Up 19 seconds k8s_redis.caa18858_redis.default.etcd_1414684622_1b43fe35
创建replicationController
- {
- "id": "redisController",
- "apiVersion": "v1beta1",
- "kind": "ReplicationController",
- "desiredState": {
- "replicas": 1,
- "replicaSelector": {"name": "redis"},
- "podTemplate": {
- "desiredState": {
- "manifest": {
- "version": "v1beta1",
- "id": "redisController",
- "containers": [{
- "name": "redis",
- "image": "dockerfile/redis",
- "imagePullPolicy": "PullIfNotPresent",
- "ports": [{
- "containerPort": 6379,
- "hostPort": 6379
- }]
- }]
- }
- },
- "labels": {"name": "redis"}
- }},
- "labels": {"name": "redis"}
- }
然后,通过命令行工具kubecfg提交:
- ./kubecfg -c redisController.json create /replicationControllers
提交完后,通过kubecfg查看replicationController状态:
- # ./kubecfg list /replicationControllers
- ID Image(s) Selector Replicas
- ---------- ---------- ---------- ----------
- redisController dockerfile/redis name=redis 1
同时,1个pod也将被自动创建出来,即使我们故意删除该pod,replicationController也将保证创建1个新pod。 |
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