下載依賴文件，離線安裝
離線下載
### 下載到指定目錄
$ sudo yum install <package-name> --downloadonly --downloaddir=/tmp
redis依賴包
yum install gcc-c++ --downloadonly --downloaddir=/data/downloads/redis
yum install centos-release-scl --downloadonly --downloaddir=/data/downloads/redis
yum install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils --downloadonly --downloaddir=/data/downloads/redis
mysql依賴包
yum install perl perl-devel perl-Data-Dumper libaio-devel --downloadonly --downloaddir=/data/downloads/mysql
nginx依賴包
yum -y install gcc gcc-c++ kernel-devel --downloadonly --downloaddir=/data/downloads/nginx
yum -y install pcre-devel --downloadonly --downloaddir=/data/downloads/nginx
yum -y install openssl openssl-devel --downloadonly --downloaddir=/data/downloads/nginx
離線安裝
# 因為部分rpm包互相依賴，只能用此方法安裝。
rpm -ivh *.rpm --nodeps --force