Centos下Nginx版本如何平滑升级与回滚？

<code class="bash">systemctl stop firewalld.service
systemctl disable firewalld.service
systemctl mask firewalld
systemctl stop firewalld
yum remove firewalld</code>

<code class="bash">yum install iptables-services</code>

<code class="bash">vi /etc/sysconfig/iptables</code>

<code class="bash">systemctl restart iptables.service
systemctl enable iptables.service
/usr/libexec/iptables/iptables.init restart</code>

<code class="bash">vi /etc/selinux/config</code>

<code class="bash">setenforce 0</code>

<code class="bash">yum install make gcc gcc-c++ perl zlib-devel</code>

<code class="bash">cd /usr/local/src
mkdir /usr/local/pcre
tar zxvf pcre-8.45.tar.gz
cd pcre-8.45
./configure --prefix=/usr/local/pcre
make
make install</code>

<code class="bash">cd /usr/local/src
mkdir /usr/local/zlib
tar zxvf zlib-1.2.12.tar.gz
cd zlib-1.2.12
./configure --prefix=/usr/local/zlib
make
make install</code>

<code class="bash">cd /usr/local/src
mkdir /usr/local/openssl
tar zxvf openssl-1.1.1q.tar.gz
cd openssl-1.1.1q
./config -fPIC shared zlib --prefix=/usr/local/openssl
make
make install</code>

<code class="bash">groupadd www
useradd -g www www -s /bin/false</code>

<code class="bash">cd /usr/local/src
tar zxvf ngx_cache_purge-2.3.tar.gz
tar zxvf nginx-1.18.0.tar.gz # 或 nginx-1.22.0.tar.gz
cd nginx-1.18.0 # 或 nginx-1.22.0
./configure --prefix=/usr/local/nginx --user=www --group=www --without-http_memcached_module --with-http_stub_status_module --with-http_ssl_module --with-http_v2_module --with-http_gzip_static_module --with-http_realip_module --with-stream --with-openssl=/usr/local/src/openssl-1.1.1q --with-zlib=/usr/local/src/zlib-1.2.12 --with-pcre=/usr/local/src/pcre-8.45 --add-module=../ngx_cache_purge-2.3
make
make install</code>

<code class="bash">/usr/local/nginx/sbin/nginx</code>

<code class="bash">/usr/local/nginx/sbin/nginx -V</code>

<code class="bash">cp -r /usr/local/nginx /usr/local/nginx.bak</code>