1. 使用下面的脚本更新 kernel

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
yum --enablerepo=elrepo-kernel install kernel-ml

2. 编辑“/etc/default/grub”文件，修改 “GRUB_DEFAULT” 为 0
3. 运行下面的命令重建内核配置

grub2-mkconfig -o /boot/grub2/grub.cfg 

4. 重启服务器查看kernel 是否升级成功

参考链接： https://linuxstory.org/how-to-install-or-upgrade-the-latest-kernel-in-centos-7/#:~:text=%E5%9C%A8%20CentOS%207%20%E5%90%AF%E7%94%A8%20ELRepo%20%E4%BB%93%E5%BA%93%E5%90%AF%E7%94%A8%E5%90%8E%EF%BC%8C%E4%BD%A0%E5%8F%AF%E4%BB%A5%E4%BD%BF%E7%94%A8%E4%B8%8B%E9%9D%A2%E7%9A%84%E5%91%BD%E4%BB%A4%E5%88%97%E5%87%BA%E5%8F%AF%E7%94%A8%E7%9A%84%E5%86%85%E6%A0%B8%E7%9B%B8%E5%85%B3%E5%8C%85%EF%BC%9A%20%23%20yum,-%20%E6%89%BE%E5%87%BA%E5%8F%AF%E7%94%A8%E7%9A%84%E5%86%85%E6%A0%B8%E7%89%88%E6%9C%AC%20%E6%8E%A5%E4%B8%8B%E6%9D%A5%EF%BC%8C%E5%AE%89%E8%A3%85%E6%9C%80%E6%96%B0%E7%9A%84%E4%B8%BB%E7%BA%BF%E7%A8%B3%E5%AE%9A%E5%86%85%E6%A0%B8%EF%BC%9A%20%23%20yum%20–enablerepo%3Delrepo-kernel%20install%20kernel-ml

运行以下脚本安装nginx , 该脚本只针对nginx-1.20.1 版本

#!/bin/bash
## install nginx

WORK_DIR=`mktemp -d`
yum install wget gcc gcc-c++ automake pcre pcre-devel zlib-devel openssl openssl-devel  git libxml2-devel libxslt-devel perl-devel perl-ExtUtils-Embed -y
cd $WORK_DIR
git clone https://github.com/chobits/ngx_http_proxy_connect_module.git
wget http://nginx.org/download/nginx-1.20.1.tar.gz
tar zxvf nginx-1.20.1.tar.gz && cd nginx-1.20.1
patch -p1 < $WORK_DIR/ngx_http_proxy_connect_module/patch/proxy_connect_rewrite_1018.patch
./configure --prefix=/opt/nginx --add-module=$WORK_DIR/ngx_http_proxy_connect_module --user=apache --group=apache --with-http_ssl_module --with-http_stub_status_module --with-http_gzip_static_module --with-pcre --with-http_v2_module --with-http_dav_module --with-http_flv_module --with-http_realip_module --with-http_addition_module --with-http_xslt_module --with-http_sub_module --with-http_random_index_module --with-http_degradation_module --with-http_secure_link_module --with-http_perl_module --with-debug --with-file-aio --with-stream --with-ld-opt=-Wl,-E
make && make install

cd  ~
[ -d $WORK_DIR ] && rm $WORK_DIR -rf

## 添加nginx运行账户
groupadd apache
useradd -g apache -s /sbin/nologin -c "apache" apache

下面是一个正向代理的配置文件示例:

server {
     listen  0.0.0.0:10713;

     access_log logs/10713.access.log;
     error_log logs/10713.error.log;

     resolver                       114.114.114.114  ipv6=off; # 关闭ipv6 解决可能会出现失败的问题

     proxy_connect;
     proxy_connect_allow            all; # 允许所有接口通过该端口转发
     proxy_connect_connect_timeout  100s;
     proxy_connect_read_timeout     100s;
     proxy_connect_send_timeout     100s;

     # forward proxy for non-CONNECT request
     location / {
         proxy_pass http://$http_host;  # 这儿的设置可以解决代理非常规端口的问题
         proxy_set_header Host $host;
     }
 }

参考: https://github.com/chobits/ngx_http_proxy_connect_module

以下为准备的服务器信息

在两台服务器分别安装 RabbitMQ 参考 rabbitmq安装与使用

在两台服务器里面的 ‘/etc/hosts’ 里面绑定以下内容

192.168.19.10 mq01
192.168.19.11 mq02

修改 “/var/lib/rabbitmq/.erlang.cookie” 里面的内容，保证 里面的内容一致，并且权限为 400

在第二台服务器里面运行以下命令，将第二台服务器加入到集群中

service rabbitmq-server restart
rabbitmqctl stop_app
rabbitmqctl reset
rabbitmqctl join_cluster --ram rabbit@mq01
rabbitmqctl start_app

使用以下命令给 test 创建一个镜像集群

rabbitmqctl add_vhost test
rabbitmqctl set_policy -p test ha "^" '{"ha-mode":"all","ha-sync-mode":"automatic"}'

节点的移除使用以下命令：

rabbitmqctl stop_app
rabbitmqctl reset
rabbitmqctl start_app

参考链接： https://www.jianshu.com/p/a031c7d53333

安装系统为centos7.x

yum install centos-release-scl -y
cd /opt && wget https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm
rpm -i pgdg-redhat-repo-latest.noarch.rpm
[ -f /opt/pgdg-redhat-repo-latest.noarch.rpm ] && rm /opt/pgdg-redhat-repo-latest.noarch.rpm -rf
yum clean all && yum makecache && yum install postgresql11* -y
/usr/pgsql-11/bin/postgresql-11-setup initdb 
systemctl enable postgresql-11 && systemctl stop postgresql-11
mkdir -p /opt/data/postgresql11 && chown postgres:postgres /opt/data/postgresql11 -R
cd /var/lib/pgsql/11/ && mv * /opt/data/postgresql11/  
sed -i 's/Environment=PGDATA=\/var\/lib\/pgsql\/11\/data\//Environment=PGDATA=\/opt\/data\/postgresql11\/data\//g' /usr/lib/systemd/system/postgresql-11.service
systemctl daemon-reload
systemctl start postgresql-11

• 安装依赖

yum install rng-tools -y  ## 该软件会自动补充熵池，避免solr运行时报错
yum install java -y  ## 安装java依赖

• 安装solr命令

cd /opt
wget http://mirror.bit.edu.cn/apache/lucene/solr/8.2.0/solr-8.2.0.tgz
tar xzf solr-8.2.0.tgz
/opt/solr-8.2.0/bin/install_solr_service.sh /opt/solr-8.2.0.tgz
service solr start
service solr restart
chkconfig solr on
[  -f /opt/solr-8.2.0.tgz ] && rm /opt/solr-8.2.0.tgz -rf

参考文章：
https://blog.csdn.net/fukai8350/article/details/80429978
https://devops.ionos.com/tutorials/install-and-configure-apache-solr-on-centos-7/