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Ubuntu 20.04 在 4 月 23 日正式發行，發行版代號為 Focal Fossa，Linux Kernel 為 5.4。這次除了在安全性與性能上再次提升外，在檔案系統的部分，這次原生支援了 exFAT，並改善 ZFS 檔案系統的相容性。 現在使用 container 的需求量很大，安裝完後的第一件事情就是馬上來裝個 Docker，follow 官方的標準安裝流程： sudo apt-get remove -y docker docker-engine docker.io containerd runc; \ sudo apt-get update && \ sudo apt-get install -y apt-transport-https ca-certificates curl gnupg-agent software-properties-common && \ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add - && \ sudo add-apt-repository \ "deb [arch=amd64] https://download.docker.com/linux/ubuntu \ $(lsb_release -cs) \ stable" && \ sudo apt-get update && \ sudo apt-get install -y docker-ce docker-ce-cli containerd.io 這時候問題來了，做到 add-apt-repository 這段的時候會出錯： Hit:1 http://tw.archive.ubuntu.com/ubuntu focal InRelease Hit:2 http://tw.archive.ubuntu.com/ubuntu focal-updates InRelease Hit:3 http://tw.archive.ubuntu.com/ubuntu focal-backports InRelease Hit:4 http://tw.archive.ubuntu.com/ubuntu focal-security InRelease Ign:5 https://download.docker.com/linux/ubuntu focal InRelease Err:6 https://download.docker.com/linux/ubuntu focal Release 404 Not Found [IP: 13.35.153.117 443] Reading package lists... Done E: The repository 'https://download.docker.com/linux/ubuntu focal Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. 為什麼呢？因為 20.04 才剛發布，Docker repository 還沒這麼快更新。直接到 mirror 的網頁目錄看，focal 並沒有出現。 但是不用擔心，因為新版發布時，內建的 packages info 中收錄的絕大多數軟體都非常的新，基本上跟你自己抓的差不了多少。 執行 apt show docker.io 查看 Docker 版本： Package: docker.io Version: 19.03.8-0ubuntu1 Built-Using: glibc (= 2.31-0ubuntu4) Priority: optional Section: universe/admin Origin: Ubuntu Maintainer: Ubuntu Developers <[email protected]> Original-Maintainer: Paul Tagliamonte <[email protected]> Bugs: https://bugs.launchpad.net/ubuntu/+filebug Installed-Size: 192 MB Depends: adduser, containerd (>= 1.2.6-0ubuntu1~), iptables, debconf (>= 0.5) | debconf-2.0, libc6 (>= 2.8), libdevmapper1.02.1 (>= 2:1.02.97), libseccomp2 (>= 2.1.0), libsystemd0 (>= 209~) Recommends: ca-certificates, cgroupfs-mount | cgroup-lite, git, pigz, ubuntu-fan, xz-utils, apparmor Suggests: aufs-tools, btrfs-progs, debootstrap, docker-doc, rinse, zfs-fuse | zfsutils Breaks: docker (<< 1.5~) Replaces: docker (<< 1.5~) Homepage: https://www.docker.com/community-edition Download-Size: 38.9 MB APT-Manual-Installed: yes APT-Sources: http://free.nchc.org.tw/ubuntu focal/universe amd64 Packages Description: Linux container runtime Docker complements kernel namespacing with a high-level API which operates at the process level. It runs unix processes with strong guarantees of isolation and repeatability across servers. . Docker is a great building block for automating distributed systems: large-scale web deployments, database clusters, continuous deployment systems, private PaaS, service-oriented architectures, etc. . This package contains the daemon and client. Using docker.io on non-amd64 hosts is not supported at this time. Please be careful when using it on anything besides amd64. . Also, note that kernel version 3.8 or above is required for proper operation of the daemon process, and that any lower versions may have subtle and/or glaring issues. 目前的最新發行版也是 19.03.8 執行 apt show docker-compose 查看 Docker Compose 版本： Package: docker-compose Version: 1.25.0-1 Priority: optional Section: universe/admin Origin: Ubuntu Maintainer: Ubuntu Developers <[email protected]> Original-Maintainer: Docker Compose Team <[email protected]> Bugs: https://bugs.launchpad.net/ubuntu/+filebug Installed-Size: 667 kB Depends: python3-cached-property (>= 1.2.0), python3-docker (>= 4.0.0), python3-dockerpty (>= 0.4.1), python3-docopt (>= 0.6.1), python3-jsonschema, python3-requests (>= 2.20.0), python3-six (<< 2), python3-six (>= 1.3.0), python3-texttable (>= 0.9.0), python3-websocket (>= 0.32.0), python3-yaml (>= 3.10), python3:any (>= 3.6~), python3-distutils Recommends: docker.io (>= 1.9.0) Homepage: https://docs.docker.com/compose/ Download-Size: 92.7 kB APT-Manual-Installed: yes APT-Sources: http://free.nchc.org.tw/ubuntu focal/universe amd64 Packages Description: Punctual, lightweight development environments using Docker docker-compose is a service management software built on top of docker. Define your services and their relationships in a simple YAML file, and let compose handle the rest. Docker Compose 不是最新版，但其實也就只有 patch 版號有差而已，minor 是一樣的，不構成問題。 所以就放心的直接安裝系統自帶的版本就可以了~ sudo apt install -y docker.io docker-compose 檢查狀態，一切正常 [email protected]:~$ sudo docker info Client: Debug Mode: false Server: Containers: 0 Running: 0 Paused: 0 Stopped: 0 Images: 0 Server Version: 19.03.8 Storage Driver: overlay2 Backing Filesystem: Supports d_type: true Native Overlay Diff: true Logging Driver: json-file Cgroup Driver: cgroupfs Plugins: Volume: local Network: bridge host ipvlan macvlan null overlay Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog Swarm: inactive Runtimes: runc Default Runtime: runc Init Binary: docker-init containerd version: runc version: init version: Security Options: apparmor seccomp Profile: default Kernel Version: 5.4.0-26-generic Operating System: Ubuntu 20.04 LTS OSType: linux Architecture: x86_64 CPUs: 2 Total Memory: 3.817GiB Name: ubuntu-server-focal ID: C6PM:ZCVS:NXVA:7SBG:P373:2SZJ:7FJB:C7XF:2HC6:QUE2:AJYW:MQGG Docker Root Dir: /var/lib/docker Debug Mode: false Registry: https://index.docker.io/v1/ Labels: Experimental: false Insecure Registries: 127.0.0.0/8 Live Restore Enabled: false WARNING: No swap limit support [email protected]:~$ sudo docker-compose -v docker-compose version 1.25.0, build unknown