Software Engineer Notes (Ziv Birer blog)

After docker installed, it is recommended to check it with below command: sudo docker run hello-world When it fails to run, it might be a missing proxy configuration. Docker has its own proxy configuration and it does not use http_proxy  variable. Define docker proxy: Edit  etc/systemd/system/docker.service.d/http-proxy.conf and add proxy under [Service] section: [Service] Environment="http_proxy=http://PROXY_MACHINE_REAL_NAME:8080" "https_proxy=http://PROXY_MACHINE_REAL_NAME:8080" "no_proxy=127.0.0.1,localhost,mydyumserver"

When docker installed according  https://docs.docker.com/engine/installation/linux/rhel/  there is below error (on some RHEL 7 machines) Error Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-               : manager This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register. You have enabled checking of packages via GPG keys. This is a good thing. However, you do not have any GPG public keys installed. You need to download the keys for packages you wish to install and install them. You can do that by running the command:     rpm --import public.gpg.key Alternatively you can specify the url to the key you would like to use for a repository in the 'gpgkey' option in a repository section and yum will install it for you. For more information contact your distribution or package provider. ...