安装docker问题：
CentOS 8中安装Docker出现和Podman冲突 problem with installed package podman-1.4.2-5.module_el8.1.0+237+63e26edc.x86_64
Error: Problem: problem with installed package buildah-1.11.6-7.module_el8.2.0+305+5e198a41.x86_64 - package buildah-1.11.6-7.module_el8.2.0+305+5e198a41.x86_64 requires runc >= 1.0.0-26, but none of the providers can be installed - package containerd.io-1.3.7-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-65.rc10.module_el8.2.0+305+5e198a41.x86_64 - package containerd.io-1.3.7-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-65.rc10.module_el8.2.0+305+5e198a41.x86_64 - package docker-ce-3:19.03.13-3.el8.x86_64 requires containerd.io >= 1.2.2-3, but none of the providers can be installed - conflicting requests - package runc-1.0.0-56.rc5.dev.git2abd837.module_el8.2.0+303+1105185b.x86_64 is filtered out by modular filtering - package runc-1.0.0-64.rc10.module_el8.2.0+304+65a3c2ac.x86_64 is filtered out by modular filtering (try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)
解决：
yum install docker-ce #执行这个 yum install --allowerasing docker-ce
