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O'Reilly Platform
book
Kubernetes即学即用(第二版)
by
Brendan Burns
,
Joe Beda
,
Kelsey Hightower
June 2021
Intermediate to advanced
300 pages
5h 4m
Chinese
China Electric Power Press Ltd.
Content preview from
Kubernetes即学即用(第二版)
34
|
第
2
章
2.5 Docker
容器运行时
Kubernetes
提供了一个用于描述应用程序部署的
API
,但该
API
需要依赖容
器运行时才能建立应用程序容器,而且这一步需要用到目标操作系统上的原
生容器
API
。在
Linux
系统上,这一步就是配置
cgroup
和命名空间。容器运
行时接口(
Container Runtime Interface
,
CRI
)标准定义了容器运行时的接口。
该
CRI API
由许多不同的程序实现,包括
Docker
构建的
containerd-cri
以
及红帽提供的
cri-o
实现。
2.5.1
通过
Docker
运行容器
尽管在
Kubernetes
中,容器一般由每个节点上名叫
kubelet
的守护进程启动,
但通过
Docker
命令行工具学习使用容器更加容易。我们可以利用
Docker CLI
部署容器。如果想利用镜像
gcr.io/kuar-demo/kuard-amd64:blue
部署容器,
则需要运行以下命令:
$
docker run -d --name kuard \
--publish 8080:8080 \
gcr.io/kuar-demo/kuard-amd64:blue
这个命令将启动
kuard
容器,并将本地计算机上的端口
8080
映射到容器的
8080
端口上。选项
--publish
可以缩写为
-p
。因为每个容器都有自己的
IP
地址,所以这种转发很有必要,只有这样你监听的才是容器内的
localhost
,
而非计算机的端口。如果没有端口转发,则你的计算机就无法连接容器。选
项
-d
指定该容器应在后台运行(守护进程),而 ...
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Publisher Resources
ISBN: 9787519856762