management

Docker OS Images : Centos7

Simple container used to have an os container running in openshift and ready to investigate using sysadmin tools. This image is based on centos/s2i-core-centos7 done by sclorg.

You can find information on this image and how to use it by visiting the Dockerhub registry

This container contain updated core OS rpm (kernel, libs,...) as well as usefull tools like pwgen, tar, zip, psmisc, procps, coreutils, findutils, wget

| | Dockerhub Registry | Sources | STARTX Profile | |-------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------|----------------------------------------------------------------------|-----------------------------------------------|

Running from dockerhub registry

• with docker you can run docker run -it --name="centos" startx/openshift-centos from any docker host

• with docker-compose you can create a docker-compose.yml file with the following content

  fedora:
  image: startx/openshift-centos:latest
  container_name: "os-ocp-centos7"
  environment:
  CONTAINER_TYPE: "os"
  CONTAINER_SERVICE: "fedora"
  CONTAINER_INSTANCE: "os-ocp-centos7"
  

Using this image in your own container

You can use this Dockerfile template to start a new personalized container based on this container

FROM startx/openshift-centos:latest
#... your container specifications
CMD ["/bin/sx"]

Environment variable

Variable	Type	Mandatory	Description
CONTAINER_INSTANCE	string	yes	Container name. Should be uning to get fine grained log and application reporting
CONTAINER_TYPE	string	no	Container family (os, service, application. could be enhanced
CONTAINER_SERVICE	string	no	Define the type of service or application provided
HOSTNAME	auto	auto	Container unique id automatically assigned by docker daemon at startup

For advanced users

You you want to use this container and code to build and create locally this container. You can follow theses instructions to setup and working environment.

This section will help you if you want to :

• Get latest version of this container OS
• Enhance container content by adding instruction in Dockefile before build step

You must have a working environment with the source code of this repository. Read and follow how to setup your working environment to get a working directory. The following instructions assume you are at the top level of your working directory.

Build & run a container using docker

1. Jump into the container directory with cd OS
2. Build the container using docker build -t fedora .
3. Run this container
   1. Interactively with docker run -it fedora. If you add a second parameter (like /bin/bash) to will run this command instead of the default entrypoint. Usefull to interact with this container (ex: /bin/bash, /bin/ps -a, /bin/df -h,...)
   2. As a daemon with docker run -d fedora

Build & run a container using docker-compose

1. Jump into the container directory with cd OS
2. Run this container
   1. Interactively with docker-compose up Startup logs appears and escaping this command stop the container
   2. As a daemon with docker-compose up -d. Container startup logs can be read using docker-compose logs