最近在嘗試閱讀docker源碼，一直想弄明白docker關於namespace等的代碼的在哪，以及怎麼觸發。然而在閱讀時發現根本找不到代碼。。。想着還是先源碼安裝下docker，然後邊運行邊打印些調試信息看看再說
安裝之前
Docker源碼需在docker容器編譯環境中編譯，所以先安裝docker，安裝環境依舊是ubuntu14.04
echo "deb https://apt.dockerproject.org/repo ubuntu-trusty main" | sudo tee /etc/apt/sources.list.d/docker.list
sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install docker-engine起初是使用apt-get install docker.io安裝，但在編譯源碼的時候會遇到ARG錯誤。
安裝
docker的安裝命令很簡單，雖然錯誤很多= =
apt-get install make git golang
git clone https://[email protected]/docker/docker
cd docker
make build
make binary遇到的問題與解決方案
Unknown instruction: ARG
原因：
Docker Hub’s automated build is still running Docker 1.8 and doesn’t support ARG yet. There is a github issue tracking their upgrade to 1.9.
解決方案：採用安裝最新的docker-engine方式
docker daemon啓動失敗
FATA[0000] Error starting daemon: error initializing graphdriver: "/var/lib/docker" contains several valid graphdrivers: aufs, devicemapper; Please cleanup or explicitly choose storage driver (-s <DRIVER>)解決方案：移除devicemap文件夾，如 mv /var/lib/docker/devicemapper/ .
make build出錯一
Step 6 : RUN apt-get update && apt-get install -y apparmor apt-utils aufs-tools automake bash-completion binutils-mingw-w64 bsdmainutils btrfs-tools build-essential clang createrepo curl dpkg-sig gcc-mingw-w64 git iptables jq libapparmor-dev libcap-dev libltdl-dev libsqlite3-dev libsystemd-journal-dev libtool mercurial net-tools pkg-config python-dev python-mock python-pip python-websocket ubuntu-zfs xfsprogs libzfs-dev tar zip --no-install-recommends && pip install awscli==1.10.15
---> Running in 32ad02db3575
Get:1 http://ppa.launchpad.net trusty InRelease [15.5 kB]
Ign http://httpredir.debian.org jessie InRelease
Get:2 http://httpredir.debian.org jessie-updates InRelease [142 kB]
Get:3 http://security.debian.org jessie/updates InRelease [63.1 kB]
Get:4 http://httpredir.debian.org jessie Release.gpg [2373 B]
Get:5 http://ppa.launchpad.net trusty/main amd64 Packages [5150 B]
Get:6 http://httpredir.debian.org jessie-updates/main amd64 Packages [17.6 kB]
Get:7 http://httpredir.debian.org jessie Release [148 kB]
Get:8 http://httpredir.debian.org jessie/main amd64 Packages [9035 kB]
Get:9 http://security.debian.org jessie/updates/main amd64 Packages [232 kB]
Fetched 9662 kB in 19s (504 kB/s)
W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie/main/binary-amd64/Packages Hash Sum mismatch
W: Failed to fetch http://security.debian.org/dists/jessie/updates/main/binary-amd64/Packages Hash Sum mismatch
E: Some index files failed to download. TheW: Failed to fetch http://httpredir.debian.org/debian/dists/jessie/main/binary-amd64/Packages Hash Sum mismatch看樣子是源的問題哎╮(╯▽╰)╭
而且是RUN指令，應該是dockerfile運行容器之後的源錯誤，so，看下docker/Dockerfile
# ARG APT_MIRROR=httpredir.debian.org
RUN sed -i s/httpredir.debian.org/$APT_MIRROR/g /etc/apt/sources.list在這裏修改了源~從網上重新找個ftp.cn.debian.org，然而，。。。還是錯。。。
好吧，那把這兩句直接全部註釋掉，用163的debian源內容echo到容器裏，執行
RUN echo "deb http://mirrors.163.com/debian/ jessie main non-free contrib\ndeb http://mirrors.163.com/debian/ jessie-updates main non-free contrib\ndeb http://mirrors.163.com/debian/ jessie-backports main non-free contrib\ndeb-src http://mirrors.163.com/debian/ jessie main non-free contrib\ndeb-src http://mirrors.163.com/debian/ jessie-updates main non-free contrib\ndeb-src http://mirrors.163.com/debian/ jessie-backports main non-free contrib\ndeb http://mirrors.163.com/debian-security/ jessie/updates main non-free contrib\ndeb-src http://mirrors.163.com/debian-security/ jessie/updates main non-free contrib" | tee /etc/apt/sources.list再執行make build，出現依賴問題，那就用aptitude吧
RUN apt-get update && apt-get install -y aptitude
RUN aptitude install -y \ （同時去掉–no-install-recommends\那一行）
make build出錯二
Step 15 : RUN set -x && export SECCOMP_PATH="$(mktemp -d)" && curl -fsSL "https://github.com/seccomp/libseccomp/releases/download/v${SECCOMP_VERSION}/libseccomp-${SECCOMP_VERSION}.tar.gz" | tar -xzC "$SECCOMP_PATH" --strip-components=1 && ( cd "$SECCOMP_PATH" && ./configure --prefix=/usr/local && make && make install && ldconfig ) && rm -rf "$SECCOMP_PATH"
---> Running in 4ad66d28289d
+ mktemp -d
+ export SECCOMP_PATH=/tmp/tmp.TWPYfciRjC
+ curl -fsSL https://github.com/seccomp/libseccomp/releases/download/v2.3.1/libseccomp-2.3.1.tar.gz
+ tar -xzC /tmp/tmp.TWPYfciRjC --strip-components=1
curl: (56) SSL read: error:00000000:lib(0):func(0):reason(0), errno 104
gzip: stdin: unexpected end of file
tar: Unexpected EOF in archive
tar: Unexpected EOF in archive
tar: Error is not recoverable: exiting now網絡問題，網上有說先下載下來再用ADD添加進去，結果發現校園網貌似訪問這挺快的，連上vpn再執行就行了。。
make binary 出錯
ERROR：/usr/local/go/pkg/tool/linux_amd64/link: running gcc failed: fork/exec /usr/bin/gcc: cannot allocate memory內存不足~增大虛擬機內存唄
安裝結果
make build
make binary
