CoreOS实践(2)—在coreos上安装Kubernetes

下载kubernetes

sudo mkdir -p /opt/bin

sudo wget https://storage.googleapis.com/kubernetes/binaries.tar.gz

sudo tar -xvf binaries.tar.gz -C /opt/bin

git clone https://github.com/kelseyhightower/kubernetes-coreos.git

sudo cp kubernetes-coreos/units/* /etc/systemd/system/

启动docker服务

$ sudo vi /etc/systemd/system/docker.service

$ sudo systemctl daemon-reload

$ sudo systemctl restart docker

$ sudo systemctl status docker

启动kubernetes的相关服务

sudo systemctl start apiserver

sudo systemctl start controller-manager

sudo systemctl start kubelet

sudo systemctl start proxy

$ sudo systemctl status apiserver

● apiserver.service - Kubernetes API Server

Loaded: loaded (/etc/systemd/system/apiserver.service; disabled)

Active: active (running) since Mon 2014-09-22 07:00:58 UTC; 5s ago

Docs: https://github.com/GoogleCloudPlatform/kubernetes

Main PID: 1099 (apiserver)

CGroup: /system.slice/apiserver.service

└─1099 /opt/bin/apiserver --address=127.0.0.1 --port=8080 --etcd_servers=http://127.0.0.1:4001 --mac...

Sep 22 07:00:58 core-01 systemd[1]: Starting Kubernetes API Server...

Sep 22 07:00:58 core-01 systemd[1]: Started Kubernetes API Server.

Sep 22 07:00:58 core-01 apiserver[1099]: I0922 07:00:58.466359 01099 apiserver.go:76] No cloud provider specified.

Sep 22 07:00:58 core-01 apiserver[1099]: E0922 07:00:58.470180 01099 healthy_registry.go:77] 127.0.0.1 fai...fused

Sep 22 07:00:58 core-01 apiserver[1099]: I0922 07:00:58.472353 01099 log.go:151] GET /api/v1beta1/services...) 200

Hint: Some lines were ellipsized, use -l to show in full.

创建pod

$cat kubernetes-coreos/pods/redis.json

{

"id": "redis",

"desiredState": {

"manifest": {

"version": "v1beta1",

"id": "redis",

"containers": [{

"name": "redis",

"image": "dockerfile/redis",

"ports": [{

"containerPort": 6379,

"hostPort": 6379

}]

}]

}

},

"labels": {

"name": "redis"

}

}

$ /opt/bin/kubecfg -h http://127.0.0.1:8080 -c kubernetes-coreos/pods/redis.json create /pods

ID                  Image(s)            Host                Labels              Status

----------          ----------          ----------          ----------          ----------

redis               dockerfile/redis    /                   name=redis          Waiting

core@core-01 ~ $ kubecfg list /pods

ID                  Image(s)            Host                Labels              Status

----------          ----------          ----------          ----------          ----------

redis               dockerfile/redis    /                   name=redis          Waiting

在操作过程中发现pod的状态一直为Waiting状态。由于scheduler服务没有启动的原因，目前kelseyhightower/kubernetes-coreos还没有scheduler.service，但已经存在PR。参考这里。

core@core-01 /etc/systemd/system $ cat scheduler.service

[Unit]

After=apiserver.service

ConditionFileIsExecutable=/opt/bin/scheduler

Description=Kubernetes Scheduler

Documentation=https://github.com/GoogleCloudPlatform/kubernetes

Wants=apiserver.service

[Service]

ExecStart=/opt/bin/scheduler \

--logtostderr=true \

--master=127.0.0.1:8080

Restart=always

RestartSec=10

[Install]

WantedBy=multi-user.target

启动scheduler.service。

测试redis

$ docker run -t -i dockerfile/redis /usr/local/bin/redis-cli -h 10.1.42.1

10.1.42.1:6379> help

redis-cli 2.8.17

Type: "help @<group>" to get a list of commands in <group>

"help <command>" for help on <command>

"help <tab>" to get a list of possible help topics

"quit" to exit

10.1.42.1:6379> help set

SET key value [EX seconds] [PX milliseconds] [NX|XX]

summary: Set the string value of a key

since: 1.0.0

group: string

10.1.42.1:6379> SET key1 value1

OK

10.1.42.1:6379> help get

GET key

summary: Get the value of a key

since: 1.0.0

group: string

10.1.42.1:6379> GET key1

"value1"

主要参考

[1] https://github.com/kelseyhightower/kubernetes-coreos

[2] https://coreos.com/blog/running-kubernetes-example-on-CoreOS-part-1/

作者：YY哥 
出处：http://www.cnblogs.com/hustcat/ 
本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。