Following is based on "Getting Started with Kubernetes" course provided by Sander van Vugt
Introuction:
having fresh Fedora 27 to be acted as "Containers Host":
[ab@fedora28 ~]$ hostname fedora28.ab.lab
[root@fedora28 ~]# cat /etc/redhat-release Fedora release 27 (Twenty Seven)
[root@fedora28 ~]# ip a show ens3 2: ens3:mtu 1500 qdisc fq_codel state UP group default qlen 1000 link/ether 52:54:00:c0:37:c2 brd ff:ff:ff:ff:ff:ff inet 192.168.122.39/24 brd 192.168.122.255 scope global ens3 valid_lft forever preferred_lft forever inet6 fe80::5054:ff:fec0:37c2/64 scope link valid_lft forever preferred_lft forever
[root@fedora28 ~]# dnf remove docker docker-common container-selinux docker-selinux docker-engine No match for argument: docker No match for argument: docker-common No match for argument: container-selinux No match for argument: docker-selinux No match for argument: docker-engine Error: No packages marked for removal.
[root@fedora28 ~]# rpm -qa | egrep -i 'docker|container'
Install Docker Repos:
[root@fedora28 ~]# dnf repolist Last metadata expiration check: 0:22:23 ago on Thu 05 Jul 2018 01:34:10 PM CEST. repo id repo name status *fedora Fedora 27 - x86_64 54,801 *updates Fedora 27 - x86_64 - Updates 15,360
[root@fedora28 ~]# curl -o /etc/yum.repos.d/docker-ce.repo https://download.docker.com/linux/fedora/docker-ce.repo
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 2544 100 2544 0 0 2544 0 0:00:01 --:--:-- 0:00:01 10779
[root@fedora28 ~]# dnf repolist Last metadata expiration check: 0:00:31 ago on Thu 05 Jul 2018 01:56:51 PM CEST. repo id repo name status docker-ce-stable Docker CE Stable - x86_64 8 *fedora Fedora 27 - x86_64 54,801 *updates Fedora 27 - x86_64 - Updates 15,360
Install Docker Community Edition 'docker-ce' to your machine:
[root@fedora28 ~]# dnf install docker-ce
[root@fedora28 ~]# rpm -qa | grep docker docker-ce-18.03.1.ce-1.fc27.x86_64
Start and enable docker engine:
[root@fedora28 ~]# systemctl enable docker --now Created symlink /etc/systemd/system/multi-user.target.wants/docker.service → /usr/lib/systemd/system/docker.service.
Run 'docker' command as non-root-user
[root@fedora28 ~]# grep docker /etc/group docker:x:989: [root@fedora28 ~]# usermod -aG docker ab [root@fedora28 ~]# grep docker /etc/group docker:x:989:ab
Verify the docker engine installation
[ab@fedora28 ~]$ hostname fedora28.ab.lab [ab@fedora28 ~]$ id uid=1000(ab) gid=1000(ab) groups=1000(ab),10(wheel),989(docker) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
[ab@fedora28 ~]$ docker --help | grep info info Display system-wide information
[ab@fedora28 ~]$ docker info [ab@fedora28 ~]$ docker help version Usage: docker version [OPTIONS] Show the Docker version information Options: -f, --format string Format the output using the given Go template [ab@fedora28 ~]$ docker version Client: Version: 18.03.1-ce API version: 1.37 Go version: go1.9.5 Git commit: 9ee9f40 Built: Thu Apr 26 07:19:31 2018 OS/Arch: linux/amd64 Experimental: false Orchestrator: swarm Server: Engine: Version: 18.03.1-ce API version: 1.37 (minimum version 1.12) Go version: go1.9.5 Git commit: 9ee9f40 Built: Thu Apr 26 07:23:21 2018 OS/Arch: linux/amd64 Experimental: false
[ab@fedora28 ~]$ docker info Containers: 0 Running: 0 Paused: 0 Stopped: 0 Images: 0 Server Version: 18.03.1-ce Storage Driver: overlay2 Backing Filesystem: xfs Supports d_type: true Native Overlay Diff: true Logging Driver: json-file Cgroup Driver: cgroupfs Plugins: Volume: local Network: bridge host macvlan null overlay Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog Swarm: inactive Runtimes: runc Default Runtime: runc Init Binary: docker-init containerd version: 773c489c9c1b21a6d78b5c538cd395416ec50f88 runc version: 4fc53a81fb7c994640722ac585fa9ca548971871 init version: 949e6fa Security Options: seccomp Profile: default Kernel Version: 4.17.3-100.fc27.x86_64 Operating System: Fedora 27 (Server Edition) OSType: linux Architecture: x86_64 CPUs: 1 Total Memory: 3.852GiB Name: fedora28.ab.lab ID: BT7F:YVLB:TDYO:FBWX:RPMK:62H7:EWRQ:GSYB:XZMX:3XM2:ISKU:XED6 Docker Root Dir: /var/lib/docker Debug Mode (client): false Debug Mode (server): false Registry: https://index.docker.io/v1/ Labels: Experimental: false Insecure Registries: 127.0.0.0/8 Live Restore Enabled: false
Getting help with any docker sub-command:
[ab@fedora28 ~]$ docker help info Usage: docker info [OPTIONS] Display system-wide information Options: -f, --format string Format the output using the given Go template
Search for official Fedora image:
[ab@fedora28 ~]$ docker help search
Usage: docker search [OPTIONS] TERM
Search the Docker Hub for images
Options:
-f, --filter filter Filter output based on conditions provided
--format string Pretty-print search using a Go template
--limit int Max number of search results (default 25)
--no-trunc Don't truncate output
[ab@fedora28 ~]$ docker search fedora NAME DESCRIPTION STARS OFFICIAL AUTOMATED fedora Official Docker builds of Fedora 669 [OK] [...]
Pull the official Fedora image from docker hub (docker registry):
[ab@fedora28 ~]$ docker help pull
Usage: docker pull [OPTIONS] NAME[:TAG|@DIGEST]
Pull an image or a repository from a registry
Options:
-a, --all-tags Download all tagged images in the repository
--disable-content-trust Skip image verification (default true)
[ab@fedora28 ~]$ docker pull fedora Using default tag: latest latest: Pulling from library/fedora e71c36a80ba9: Pull complete Digest: sha256:7ae08e5637170eb47c01e315b6e64e0d48c6200d2942c695d0bee61b38c65b39 Status: Downloaded newer image for fedora:latest
List the current download docker images:
[ab@fedora28 ~]$ docker help image Usage: docker image COMMAND Manage images Options: Commands: build Build an image from a Dockerfile history Show the history of an image import Import the contents from a tarball to create a filesystem image inspect Display detailed information on one or more images load Load an image from a tar archive or STDIN ls List images prune Remove unused images pull Pull an image or a repository from a registry push Push an image or a repository to a registry rm Remove one or more images save Save one or more images to a tar archive (streamed to STDOUT by default) tag Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE Run 'docker image COMMAND --help' for more information on a command.
[ab@fedora28 ~]$ docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE fedora latest cc510acfcd70 2 months ago 253MB
Show how many docker containers are running now:
[ab@fedora28 ~]$ docker help ps
Usage: docker ps [OPTIONS]
List containers
Options:
-a, --all Show all containers (default shows just running)
-f, --filter filter Filter output based on conditions provided
--format string Pretty-print containers using a Go template
-n, --last int Show n last created containers (includes all states) (default -1)
-l, --latest Show the latest created container (includes all states)
--no-trunc Don't truncate output
-q, --quiet Only display numeric IDs
-s, --size Display total file sizes
[ab@fedora28 ~]$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
Show How many containers you have even the offline ones:
[ab@fedora28 ~]$ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
Execute "echo hello world" in the new container 'Fedora'. Container will be stopped after that as nothing to do:
[ab@fedora28 ~]$ docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE fedora latest cc510acfcd70 2 months ago 253MB
[ab@fedora28 ~]$ docker help run Usage: docker run [OPTIONS] IMAGE [COMMAND] [ARG...] Run a command in a new container [..]
[ab@fedora28 ~]$ docker run fedora echo hello world hello world
[ab@fedora28 ~]$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[ab@fedora28 ~]$ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 901f42ca4f10 fedora "echo hello world" 24 seconds ago Exited (0) 23 seconds ago eloquent_elbakyan --> Note "CONTAINER ID"
Run command in Container and attach to its console:
Attach to container console:
[ab@fedora28 ~]$ docker help run | grep -E -e "[[:space:]]-i" -e "[[:space:]]-t" -e "--name"
-i, --interactive Keep STDIN open even if not attached
--name string Assign a name to the container
-t, --tty Allocate a pseudo-TTY
[ab@fedora28 ~]$ docker run -it fedora /bin/bash [root@3ed4e70d4c73 /]# uname -n 3ed4e70d4c73
Check from another window if container still up and running
[ab@fedora28 ~]$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 3ed4e70d4c73 fedora "/bin/bash" 4 minutes ago Up 4 minutes competent_villani
De-attach from the above container
[root@3ed4e70d4c73 /]#[ab@fedora28 ~]$ hostname fedora28.ab.lab [ab@fedora28 ~]$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 3ed4e70d4c73 fedora "/bin/bash" 9 minutes ago Up 9 minutes competent_villani
Attach to current working container:
[ab@fedora28 ~]$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 3ed4e70d4c73 fedora "/bin/bash" 13 minutes ago Up 13 minutes competent_villani
[ab@fedora28 ~]$ docker help attach
Usage: docker attach [OPTIONS] CONTAINER
Attach local standard input, output, and error streams to a running container
Options:
--detach-keys string Override the key sequence for detaching a container
--no-stdin Do not attach STDIN
--sig-proxy Proxy all received signals to the process (default true)
[ab@fedora28 ~]$ docker attach 3ed4e70d4c73 [root@3ed4e70d4c73 /]# uname -n 3ed4e70d4c73
Stop current working container:
Way #1 - from the console[ab@fedora28 ~]$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 3ed4e70d4c73 fedora "/bin/bash" 17 minutes ago Up 17 minutes competent_villani [ab@fedora28 ~]$ docker attach 3ed4e70d4c73 [root@3ed4e70d4c73 /]# uname -n 3ed4e70d4c73 [root@3ed4e70d4c73 /]# exit exit
[ab@fedora28 ~]$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
Way #2 - from the containers host
[ab@fedora28 ~]$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 3ed4e70d4c73 fedora "/bin/bash" 19 minutes ago Up 5 seconds competent_villani [ab@fedora28 ~]$ docker help stop Usage: docker stop [OPTIONS] CONTAINER [CONTAINER...] Stop one or more running containers Options: -t, --time int Seconds to wait for stop before killing it (default 10)
[ab@fedora28 ~]$ docker stop 3ed4e70d4c73 3ed4e70d4c73 [ab@fedora28 ~]$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
Execute a command inside current working container without attaching to the console:
[ab@fedora28 ~]$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 3ed4e70d4c73 fedora "/bin/bash" 22 minutes ago Up 16 seconds competent_villani
[ab@fedora28 ~]$ docker help exec
Usage: docker exec [OPTIONS] CONTAINER COMMAND [ARG...]
Run a command in a running container
Options:
-d, --detach Detached mode: run command in the background
--detach-keys string Override the key sequence for detaching a container
-e, --env list Set environment variables
-i, --interactive Keep STDIN open even if not attached
--privileged Give extended privileges to the command
-t, --tty Allocate a pseudo-TTY
-u, --user string Username or UID (format: [:])
-w, --workdir string Working directory inside the container
[ab@fedora28 ~]$ docker exec 3ed4e70d4c73 uname -a Linux 3ed4e70d4c73 4.17.3-100.fc27.x86_64 #1 SMP Tue Jun 26 14:19:03 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
No comments:
Post a Comment