Buildkit
BuildKit 由buildkitd守护进程和buildctl客户端组成。虽然buildctl客户端可用于 Linux、macOS 和 Windows，但buildkitd守护程序目前仅适用于 Linux。
该buildkitd守护程序需要安装以下组件：
- runc或crun
- containerd（如果你想使用容器工作）
按照流程正确安装完containerd上述组件都有
安装Buildkit
GIthub: https://github.com/moby/buildkit
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| root@master:~/app# wget https://github.com/moby/buildkit/releases/download/v0.12.4/buildkit-v0.12.4.linux-amd64.tar.gz
root@master:~/app# tar xf buildkit-v0.12.4.linux-amd64.tar.gz
root@master:~/app# mv bin/* /usr/local/sbin/
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创建Systemd单元文件
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| root@master:~/app# vi /lib/systemd/system/buildkit.service
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| [Unit]
Description=BuildKit
Requires=buildkit.socket
After=buildkit.socket
Documentation=https://github.com/moby/buildkit
[Service]
Type=notify
ExecStart=/usr/local/sbin/buildkitd --addr fd://
[Install]
WantedBy=multi-user.target
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| root@master:~/app# vi /lib/systemd/system/buildkit.socket
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| [Unit]
Description=BuildKit
Documentation=https://github.com/moby/buildkit
[Socket]
ListenStream=%t/buildkit/buildkitd.sock
SocketMode=0660
[Install]
WantedBy=sockets.target
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创建Buildkit配置文件
buildkitd 守护进程支持两个工作后端：OCI (runc) 和 containerd。
默认情况下，使用 OCI (runc) 工作线程。所以需要创建配置文件让buildkitd使用containerd作为工作后端
否则构建镜像会出现问题，且名称空间必须是buildkit否则无法使用本地镜像进行FROM！！！
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| root@master:~/app# mkdir -p /etc/buildkit/
root@master:~/app# vi /etc/buildkit/buildkitd.toml
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| [worker.oci]
enabled = false
[worker.containerd]
enabled = true
namespace = "buildkit"
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| root@master:~/app# systemctl enable --now buildkit
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使用本地镜像构建测试
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| root@master:~/app/xiaowangc/db# buildctl build --frontend dockerfile.v0 --local context=. --local dockerfile=. --output type=image,name=harbor.xiaowangc.com/app/mysql:1.0
[+] Building 1.2s (11/11) FINISHED
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 421B 0.0s
=> [internal] load metadata for docker.io/mysql/mysql-server:8.0.32 1.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> [1/6] FROM docker.io/mysql/mysql-server:8.0.32@sha256:d6c8301b7834c5b9c2b733b10b7e630f441af7bc917c74dba379f24eeeb6a313 0.1s
=> => resolve docker.io/mysql/mysql-server:8.0.32@sha256:d6c8301b7834c5b9c2b733b10b7e630f441af7bc917c74dba379f24eeeb6a313 0.1s
=> [internal] load build context 0.0s
=> => transferring context: 132B 0.0s
=> CACHED [2/6] RUN ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo Asia/Shanghai > /etc/timezone 0.0s
=> CACHED [3/6] COPY ./a.sql /docker-entrypoint-initdb.d 0.0s
=> CACHED [4/6] COPY ./b.sql /docker-entrypoint-initdb.d 0.0s
=> CACHED [5/6] COPY ./c.sql /docker-entrypoint-initdb.d 0.0s
=> CACHED [6/6] COPY ./d.sql /docker-entrypoint-initdb.d 0.0s
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => exporting manifest sha256:679dee80be7ed7d7e16a228d0a1b6877042ba1cb45b96541403ad8928e749ecd 0.0s
=> => exporting config sha256:16a5a4dc8b779513d756cf60a4e17caef59e21961085abafcd6ba3b81f5c2648 0.0s
=> => naming to harbor.xiaowangc.com/app/mysql:1.0 0.0s
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| root@master:~/app/xiaowangc/db# ctr -n buildkit i ls
REF TYPE DIGEST SIZE PLATFORMS LABELS
harbor.xiaowangc.com/app/mysql:1.0 application/vnd.docker.distribution.manifest.v2+json sha256:679dee80be7ed7d7e16... 158.2 MiB linux/amd64 -
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| root@master:~/app/xiaowangc/db# cd
root@master:~# cat Dockerfile
FROM harbor.xiaowangc.com/app/mysql:1.0
CMD sleep 3600
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| root@master:~# buildctl build --frontend dockerfile.v0 --local context=. --local dockerfile=. --output type=image,name=harbor.xiaowangc.com/app/test:1.0
[+] Building 36.8s (6/6) FINISHED
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 92B 0.0s
=> [internal] load metadata for harbor.xiaowangc.com/app/mysql:1.0 18.4s
=> [auth] sharing credentials for harbor.xiaowangc.com 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> CACHED [1/1] FROM harbor.xiaowangc.com/app/mysql:1.0@sha256:679dee80be7ed7d7e16a228d0a1b6877042ba1cb45b96541403ad8928e749ecd 18.3s
=> => resolve harbor.xiaowangc.com/app/mysql:1.0@sha256:679dee80be7ed7d7e16a228d0a1b6877042ba1cb45b96541403ad8928e749ecd 18.3s
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => exporting manifest sha256:b54a975c33c8124d162896652b08449dc0807f5e8ebcd8b4d675caa4a39d3f2d 0.0s
=> => exporting config sha256:56f3e6f2916898348f2bd92ab855b56c0a57a390ac8560f998d8065550fa024e 0.0s
=> => naming to harbor.xiaowangc.com/app/test:1.0 0.0s
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