Kubernetes基础：源码编译并构建Pause镜像

川长思鸟来 2023-07-04 06:27 22阅读 0赞

在前面的文章中我们介绍了Pause在Kubernetes中的使用，并对源码进行了解析，这篇文章介绍一下如何进行源码方式的构建和Pause镜像的构建。

# 下载源码 #

> 执行命令：git clone https://github.com/kubernetes/kubernetes

[root@liumiaocn ~]# git clone https://github.com/kubernetes/kubernetes
    Cloning into 'kubernetes'...
    remote: Enumerating objects: 227, done.
    remote: Counting objects: 100% (227/227), done.
    remote: Compressing objects: 100% (136/136), done.
    remote: Total 1068710 (delta 112), reused 91 (delta 91), pack-reused 1068483
    Receiving objects: 100% (1068710/1068710), 663.00 MiB | 11.18 MiB/s, done.
    Resolving deltas: 100% (762816/762816), done.
    Checking out files: 100% (21979/21979), done.
    [root@liumiaocn ~]#

如果速度过慢，也可以直接下载源码包，比如1.17.2的源码可使用如下命令下载

> wget https://github.com/kubernetes/kubernetes/archive/v1.17.2.tar.gz

# 执行编译 #

*  操作系统和编译器确认

[root@liumiaocn pause]# which cc
    /usr/bin/cc
    [root@liumiaocn pause]# cc --version
    cc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)
    Copyright (C) 2015 Free Software Foundation, Inc.
    This is free software; see the source for copying conditions.  There is NO
    warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    
    [root@liumiaocn pause]# gcc --version
    gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)
    Copyright (C) 2015 Free Software Foundation, Inc.
    This is free software; see the source for copying conditions.  There is NO
    warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    
    [root@liumiaocn pause]# cat /etc/redhat-release 
    CentOS Linux release 7.7.1908 (Core)
    [root@liumiaocn pause]#

*  编译源码和Makefile确认

[root@liumiaocn ~]# cd kubernetes/build/pause
    [root@liumiaocn pause]# ls
    CHANGELOG.md  Dockerfile  Makefile  orphan.c  pause.c
    [root@liumiaocn pause]#

使用make pause执行编译

[root@liumiaocn pause]# make pause
    cc -Os -Wall -Werror -static -DVERSION=v3.1-    pause.c   -o pause
    [root@liumiaocn pause]# ls
    CHANGELOG.md  Dockerfile  Makefile  orphan.c  pause  pause.c
    [root@liumiaocn pause]#

## 常见编译错误和对应方法 ##

*  缺少libc

[root@liumiaocn pause]# make pause
    cc -Os -Wall -Werror -static -DVERSION=v3.1-    pause.c   -o pause
    /usr/bin/ld: cannot find -lc
    collect2: error: ld returned 1 exit status
    make: *** [pause] Error 1
    [root@liumiaocn pause]#

> 对应方法：yum install glibc-static -y

# 构建镜像 #

*  确认ARCH

[root@liumiaocn pause]# uname -m
    x86_64
    [root@liumiaocn pause]# arch
    x86_64
    [root@liumiaocn pause]#

*  Dockerfile确认

[root@liumiaocn pause]# cat Dockerfile 
    # Copyright 2016 The Kubernetes Authors.
    #
    # Licensed under the Apache License, Version 2.0 (the "License");
    # you may not use this file except in compliance with the License.
    # You may obtain a copy of the License at
    #
    #     http://www.apache.org/licenses/LICENSE-2.0
    #
    # Unless required by applicable law or agreed to in writing, software
    # distributed under the License is distributed on an "AS IS" BASIS,
    # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    # See the License for the specific language governing permissions and
    # limitations under the License.
    
    FROM scratch
    ARG ARCH
    ADD bin/pause-${ARCH} /pause
    ENTRYPOINT ["/pause"]
    [root@liumiaocn pause]#

*  构建镜像  
    传入构建的镜像的参数x86\_64，生成pause镜像

[root@liumiaocn pause]# docker build --build-arg ARCH=x86_64 -t pause:latest .
    Sending build context to Docker daemon 1.805 MB
    Step 1/4 : FROM scratch
     ---> 
    Step 2/4 : ARG ARCH
     ---> Using cache
     ---> 9567692884cf
    Step 3/4 : ADD bin/pause-${ARCH} /pause
     ---> f57f70cb4d01
    Removing intermediate container b9c2223dceed
    Step 4/4 : ENTRYPOINT /pause
     ---> Running in d9e680f0d7e4
     ---> 941e4c6fbe0e
    Removing intermediate container d9e680f0d7e4
    Successfully built 941e4c6fbe0e
    [root@liumiaocn pause]#

*  镜像确认

[root@liumiaocn pause]# docker images |grep pause
    pause               latest              941e4c6fbe0e        5 minutes ago       895 kB
    [root@liumiaocn pause]# 
    [root@liumiaocn pause]# docker history pause
    IMAGE               CREATED             CREATED BY                                      SIZE                COMMENT
    941e4c6fbe0e        5 minutes ago       /bin/sh -c #(nop)  ENTRYPOINT ["/pause"]        0 B                 
    f57f70cb4d01        5 minutes ago       /bin/sh -c #(nop) ADD file:66af603263ce42c...   895 kB              
    9567692884cf        7 minutes ago       /bin/sh -c #(nop)  ARG ARCH                     0 B                 
    [root@liumiaocn pause]#

与官方镜像进行比较

[root@liumiaocn pause]# docker images |grep gc
    gcr.io/google_containers/pause-amd64   3.1                 da86e6ba6ca1        2 years ago         742 kB
    [root@liumiaocn pause]# docker history gcr.io/google_containers/pause-amd64:3.1
    IMAGE               CREATED             CREATED BY                                      SIZE                COMMENT
    da86e6ba6ca1        2 years ago         /bin/sh -c #(nop)  ENTRYPOINT ["/pause"]        0 B                 
    <missing>           2 years ago         /bin/sh -c #(nop) ADD file:0ea44d6c15daeb7...   742 kB              
    <missing>           2 years ago         /bin/sh -c #(nop)  ARG ARCH                     0 B                 
    [root@liumiaocn pause]#