CentOS 7默认仅支持OpenSSL 1.0.2版本，因此没办法原生支持很多新版本的特性，比如TLS 1.3等。事实上，OpenSSL已经官方淘汰了老版本的1.0.2支持。今天我们介绍一下如何在CentOS 7中安装OpenSSL 1.1.1.
请注意，由于CentOS 7的系统版本老旧，很多内置的环境都依赖老版本的OpenSSL 1.0.2, 因此安装OpenSSL 1.1.1之后可能会导致系统里其他组件失效或损坏。这里建议您升级CentOS 8, 或者备份好数据后谨慎操作。
本文作者为香菇肥牛，原文链接为https://qing.su/article/install-openssl-1-1-1-on-centos-7.html 转载需注明原文链接。感谢您的支持！
1, 安装编译环境
编译安装，我们需要安装必要的编译器和库：
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yum update
yum install wget tar make gcc perl pcre-devel zlib-devel
yum install wget tar make gcc perl pcre-devel zlib-devel
2, 编译安装OpenSSL
首先，下载OpenSSL源码包。
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wget https://www.openssl.org/source/openssl-1.1.1g.tar.gz
tar zxvf openssl-1.1.1g.tar.gz
cd openssl-1.1.1
tar zxvf openssl-1.1.1g.tar.gz
cd openssl-1.1.1
然后，编译安装：
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./config –prefix=/usr –openssldir=/etc/ssl –libdir=lib no-shared zlib-dynamic
make
make install
make
make install
编译需要3-10分钟，请耐心等待。
3, 配置环境变量
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export LD_LIBRARY_PATH=/usr/local/lib:/usr/local/lib64
echo “export LD_LIBRARY_PATH=/usr/local/lib:/usr/local/lib64” >> ~/.bashrc
echo “export LD_LIBRARY_PATH=/usr/local/lib:/usr/local/lib64” >> ~/.bashrc
此时，我们查看OpenSSL版本：
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openssl version
就可以看到已经升级为OpenSSL 1.1.1了。
综上，我们在CentOS 7系统中编译安装了OpenSSL v1.1.1. 如果您有任何疑问，欢迎在这里留言，我将尽力解答。本文作者为香菇肥牛，原文链接为https://qing.su/article/install-openssl-1-1-1-on-centos-7.html 转载需注明原文链接。感谢您的支持！
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