Compiled from the “Development Tips” series, collecting common problems and solutions in CentOS server operations. 1. Upgrading the Docker Version Uninstall the old version of Docker 1 2 3 4 5 6 $yum remove docker \ docker-common \ container-selinux \ docker-selinux \ docker-engine \ docker-engine-selinux Images, containers, data, and networks stored in /var/lib/docker/ are all preserved.

While working on servers recently, I ran into a few concepts I wasn’t clear about, so I looked up some references and organized them as follows. 1. The BLP Security Model The model divides the entities in an information system into two parts: Subject: the entity performing the operations, such