Jumper EZpad 6 Pro に付属していたキーボードは英語用レイアウトです。そのためキーボードレイアウト（＋インプットメソッド）には、英語(US)、日本語、日本語（かな漢字）の三種類を設定しています。
GNOME では ⊞ Win + SPACE を押下すると利用可能なキーボードレイアウトが下図のように表示されます。⊞ Win を押したまま SPACE を離したり押したりすることで有効なレイアウトを切り替えることができます。これを日本語レイアウトのキーボードにある（IME の ON / OFF に使っている）半角/全角 キーの代わりに使っています。
$ podman --help
NAME:
podman - manage pods and images
USAGE:
podman [global options] command [command options] [arguments...]
VERSION:
1.0.5
COMMANDS:
attach Attach to a running container
commit Create new image based on the changed container
container Manage Containers
build Build an image using instructions from Dockerfiles
create Create but do not start a container
diff Inspect changes on container's file systems
exec Run a process in a running container
export Export container's filesystem contents as a tar archive
history Show history of a specified image
image Manage images
images List images in local storage
import Import a tarball to create a filesystem image
info Display podman system information
inspect Displays the configuration of a container or image
kill Kill one or more running containers with a specific signal
load Load an image from docker archive
login Login to a container registry
logout Logout of a container registry
logs Fetch the logs of a container
mount Mount a working container's root filesystem
pause Pauses all the processes in one or more containers
list, ls, ps List containers
pod Manage pods
port List port mappings or a specific mapping for the container
pull Pull an image from a registry
push Push an image to a specified destination
restart Restart one or more containers
rm Remove one or more containers
rmi Removes one or more images from local storage
run Run a command in a new container
save Save image to an archive
search Search registry for image
start Start one or more containers
stats Display percentage of CPU, memory, network I/O, block I/O and PIDs for one or more containers
stop Stop one or more containers
tag Add an additional name to a local image
top Display the running processes of a container
umount, unmount Unmounts working container's root filesystem
unpause Unpause the processes in one or more containers
version Display the Podman Version Information
volume Manage volumes
wait Block on one or more containers
help, h Shows a list of commands or help for one command
GLOBAL OPTIONS:
--cgroup-manager value cgroup manager to use (cgroupfs or systemd, default systemd)
--cni-config-dir value path of the configuration directory for CNI networks
--conmon value path of the conmon binary
--cpu-profile value path for the cpu profiling results
--hooks-dir value set the OCI hooks directory path (may be set multiple times)
--log-level value log messages above specified level: debug, info, warn, error (default), fatal or panic (default: "error")
--namespace value set the libpod namespace, used to create separate views of the containers and pods on the system
--root value path to the root directory in which data, including images, is stored
--tmpdir value path to the tmp directory
--runroot value path to the 'run directory' where all state information is stored
--runtime value path to the OCI-compatible binary used to run containers, default is /usr/bin/runc
--storage-driver value, -s value select which storage driver is used to manage storage of images and containers (default is overlay)
--storage-opt value used to pass an option to the storage driver
--syslog output logging information to syslog as well as the console
--help, -h show help
--version, -v print the version
$
podman では docker イメージをそのまま利用できるので、そのまま置き換えて使ってみれば良いのですが、参考サイト [3] によると、Red Hat 社のカスタマーポータルにログインする時に使う Red Hat ID があれば Red Hat UBI のコンテナーイメージを利用できるということですので、Podman の最初の動作確認に利用してみました。
※ Red Hat 社の製品を評価する目的で Red Hat ID を持っているので試してみました。
まず Podman から registry.redhat.io のレジストリにログインします。ここでは Red Hat ID の代わりに Registry Service Accounts で生成した Service Account を使用しました。Service Account は "|" 区切りで 7 桁の数字と任意のアルファベットから構成されます。パスワードとして約 700 文字の Token が割り当てられます。
$ podman search registry.redhat.io/ubi8
INDEX NAME DESCRIPTION STARS OFFICIAL AUTOMATED
redhat.io registry.redhat.io/ubi8 The Universal Base Image is designed and eng... 0
redhat.io registry.redhat.io/openjdk/openjdk-11-rhel8 OpenJDK S2I image for Java Applications on U... 0
redhat.io registry.redhat.io/openjdk/openjdk-8-rhel8 OpenJDK 1.8 Image for Java Applications base... 0
redhat.io registry.redhat.io/ubi8/nodejs-10 Platform for building and running Node.js 10... 0
redhat.io registry.redhat.io/ubi8/php-72 Platform for building and running PHP 7.2 ap... 0
redhat.io registry.redhat.io/ubi8/python-27 Platform for building and running Python 2.7... 0
redhat.io registry.redhat.io/ubi8/s2i-core Base image which allows using of source-to-i... 0
redhat.io registry.redhat.io/ubi8/ubi Provides the latest release of the Red Hat U... 0
redhat.io registry.redhat.io/ubi8/ubi-minimal Provides the latest release of the Minimal R... 0
redhat.io registry.redhat.io/ubi8/dotnet-21 .NET Core 2.1 SDK and Runtime on RHEL 8 0
redhat.io registry.redhat.io/ubi8/perl-526 Platform for building and running Perl 5.26 ... 0
redhat.io registry.redhat.io/ubi8/python-36 Platform for building and running Python 3.6... 0
redhat.io registry.redhat.io/ubi8/ruby-25 Platform for building and running Ruby 2.5 a... 0
redhat.io registry.redhat.io/ubi8/dotnet-21-runtime Provides the latest release of Red Hat Enter... 0
redhat.io registry.redhat.io/ubi8/s2i-base Base image with essential libraries and tool... 0
redhat.io registry.redhat.io/ubi8/ubi-init Provides the latest release of the Red Hat U... 0
redhat.io registry.redhat.io/ubi8-init The Universal Base Image Init is designed to... 0
redhat.io registry.redhat.io/ubi8-minimal The Universal Base Image Minimal is a stripp... 0
$
$ podman images
REPOSITORY TAG IMAGE ID CREATED SIZE
registry.redhat.io/ubi8 latest 11f9dba4d1bc 3 weeks ago 216 MB
$
イメージを起動してみます。
registry.redhat.io/ubi8 のコンテナーイメージの起動
$ podman run -it registry.redhat.io/ubi8 bash
bash-4.4# cat /etc/redhat-release
Red Hat Enterprise Linux release 8.0 (Ootpa)
bash-4.4# df -h
Filesystem Size Used Avail Use% Mounted on
fuse-overlayfs 200G 2.9G 198G 2% /
tmpfs 64M 0 64M 0% /dev
tmpfs 367M 56K 367M 1% /etc/hosts
shm 63M 0 63M 0% /dev/shm
tmpfs 1.8G 0 1.8G 0% /sys/fs/cgroup
devtmpfs 1.8G 0 1.8G 0% /dev/tty
tmpfs 1.8G 0 1.8G 0% /proc/acpi
tmpfs 1.8G 0 1.8G 0% /proc/scsi
tmpfs 1.8G 0 1.8G 0% /sys/firmware
bash-4.4# dnf repolist
Updating Subscription Management repositories.
Unable to read consumer identity
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Red Hat Universal Base Image 8 (RPMs) - AppStre 429 kB/s | 2.3 MB 00:05
Red Hat Universal Base Image 8 (RPMs) - BaseOS 151 kB/s | 754 kB 00:04
Last metadata expiration check: 0:00:03 ago on Mon Oct 14 09:24:16 2019.
repo id repo name status
ubi-8-appstream Red Hat Universal Base Image 8 (RPMs) - AppStream 778
ubi-8-baseos Red Hat Universal Base Image 8 (RPMs) - BaseOS 659
bash-4.4# exit
exit
$
$ podman build -t base:centos8 .
STEP 1: FROM centos:centos8
Getting image source signatures
Copying blob 729ec3a6ada3: 66.87 MiB / 68.21 MiB [=============================]
Copying blob 729ec3a6ada3: 68.21 MiB / 68.21 MiB [=========================] 11s
Copying config 0f3e07c0138f: 2.13 KiB / 2.13 KiB [==========================] 0s
Writing manifest to image destination
Storing signatures
STEP 2: MAINTAINER bitwalk
--> 5b2faaf200d323caf1f599e482d54d69713224ad8974fa4b62c81e700bb4fca8
STEP 3: COMMIT base:centos8
--> 65e7c22f21f47daa98db529bdc5f857db45fe031f277481537f0872f3f0a0e6c
$ podman images
REPOSITORY TAG IMAGE ID CREATED SIZE
localhost/base centos8 65e7c22f21f4 About a minute ago 227 MB
<none> <none> 5b2faaf200d3 About a minute ago 227 MB
docker.io/library/centos centos8 0f3e07c0138f 12 days ago 227 MB
registry.redhat.io/ubi8 latest 11f9dba4d1bc 3 weeks ago 216 MB
$
IMAGE ID でコンテナイメージで bash を起動します。
コンテナーイメージ localhost/base (65e7c22f21f4) の起動
$ podman run -it 65e7c22f21f4 bash
[root@d7b310aea6e9 /]# cat /etc/centos-release
CentOS Linux release 8.0.1905 (Core)
[root@d7b310aea6e9 /]# df -h
Filesystem Size Used Avail Use% Mounted on
fuse-overlayfs 200G 2.6G 198G 2% /
tmpfs 64M 0 64M 0% /dev
tmpfs 367M 56K 367M 1% /etc/hosts
shm 63M 0 63M 0% /dev/shm
tmpfs 1.8G 0 1.8G 0% /sys/fs/cgroup
devtmpfs 1.8G 0 1.8G 0% /dev/tty
tmpfs 1.8G 0 1.8G 0% /proc/acpi
tmpfs 1.8G 0 1.8G 0% /proc/scsi
tmpfs 1.8G 0 1.8G 0% /sys/firmware
[root@d7b310aea6e9 /]# dnf repolist
Failed to set locale, defaulting to C
CentOS-8 - AppStream 707 kB/s | 6.0 MB 00:08
CentOS-8 - Base 1.0 MB/s | 7.9 MB 00:07
CentOS-8 - Extras 412 B/s | 2.1 kB 00:05
Last metadata expiration check: 0:00:01 ago on Mon Oct 14 10:08:18 2019.
repo id repo name status
AppStream CentOS-8 - AppStream 5069
BaseOS CentOS-8 - Base 2835
extras CentOS-8 - Extras 3
[root@d7b310aea6e9 /]# exit
exit
$
Red Hat 社が中心となってオープンソースで開発中のコンテナエンジン Podman が、将来 Docker に置き換わることになるかは定かではありませんが、RHEL/CentOS 系 Linux をメインに使っているので、わざわざ Docker を導入することをせずに、Podman をもっと使い込んでみます。
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