How about deleting servers?

“This is my third day of the November Gwen Challenge.The final text challenge in 2021”.

preface

There is a saying in the line that a programmer who has not deleted a library is not a qualified programmer. I had the privilege to experience deleting a server once. One day of daily development, I boarded the server and checked the log files, and found a large number of historical log files. The console outputs a quick output and then prompts you that some directories cannot be deleted. I hit LL, the log is gone, then CD to the root directory, check, sure enough, all files are gone. There was a buzz, and I realized I might be in serious trouble. I just deleted the server. Later, I reported it to my boss. Fortunately, it was just a test environment, and no serious consequences were caused. I was asked to try to recover.

After executing rm -rf /*, the system does not crash immediately, and the programs that have been running can still run normally. So I can export all the data immediately

1. Install the Linux operating system

1.1 Downloading the Image File

Isoredirect.centos.org/centos/7/is…

Select an appropriate domestic proxy address and download the ISO image file of the corresponding version

1.2 Making usb boot disk

• Prepare a memory not less than one memory8GtheU disk
• Download and installUltraISOCD burning tool (direct search engine search to download the latest version)
• Run as an administratorUltraISO, click on thefile → Open theDownloaded image file (CentOS-7-x86_64-DVD-2003.iso)
• Click Start → Write hard disk image

• Select a hard disk drive (USB flash drive)USB-HDD+, click Write

• Write complete, drive disk production is complete

1.3 OS Installation

• Change the boot option toUSBFor the first boot item, depending on your computer model inBIOSInterface modification.
• The installation window is displayed, and complete the installation according to the instructions. Specific reference video: www.bilibili.com/video/BV1Lz…

2. The Docker installation

Official website: www.docker.com/

2.1 Uninstalling Earlier Versions

 sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine
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2.2 Install necessary system tools

sudo yum install -y yum-utils device-mapper-persistent-data lvm2
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2.3 Adding Software Source Information

sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
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2.4 Updating the YUM Cache

sudo yum makecache fast
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2.5 installation Docker – ce

sudo yum -y install docker-ce
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2.6 Starting the Docker Service

sudo systemctl start docker
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2.7 Configuring Ali Cloud Mirroring

• Open the configuration file daemon.json

vi /etc/docker/daemon.json
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• Enter the mirror address

{
 "registry-mirrors":["https://6kx4zyno.mirror.aliyuncs.com"]
}
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• Restart the Docker service

sudo systemctl restart docker
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3. The JDK installation

3.1 Uninstalling the Built-in OpenJDK

• View the current Java version

  • java -version 
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  • [root@localhost ~]# Java -version openJDK version "1.8.0_242" OpenJDK Runtime Environment (build 1.8.0_242-b08 64-bit Server VM (Build 25.242-B08, Mixed mode)Copy the code

• See how many Java packages are installed

  • rpm -qa | grep java
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  • / root @ localhost ~ # RPM - qa | grep Java javassist 3.16.1-10. El7. Noarch nuxwdog - the client - Java - 1.0.5-1. El7. X86_64 Tzdata - Java - 2019 - c - 1. El7. Noarch python - javapackages - 3.4.1 track - 11. El7. Noarch Java - 1.8.0 comes with - its - headless - 1.8.0.242. B08-1. El7. X86_64 javapackages - tools - 3.4.1 track - 11. El7. Noarch Pki - base - Java - 10.5.17-6. El7. Noarch Java -- 1.8.0 comes with its - 1.8.0.242. B08-1. El7. X86_64 javamail - 1.4.6-8 el7. NoarchCopy the code

• Uninstall all openJDK packages

  • RPM -e --nodeps java-1.8.0-openJDK-headless-1.8.0.242.b08-1.el7.x86_64 RPM -e --nodeps java-1.8.0-openJDK-headless-1.8.0.242.b08-1.el7.x86_64 RPM -e --nodeps Java -- 1.8.0 comes with its - 1.8.0.242. B08-1. El7. X86_64Copy the code

• Check whether the uninstallation is complete

• [root@localhost ~]# Java -version-bash: /usr/bin/java: no such file or directoryCopy the code

3.2 Installing JDK1.8 Linux

• Download address www.oracle.com/java/techno…

• Upload the decompressed installation package

  tar -zxvf jdk-8u301-linux-x64.tar.gz
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• Modify environment variables based on your installation path

• vim /etc/profile
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  Export JAVA_HOME=/usr/ jav/jdk1.8.0_301 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib:$CLASSPATH export JAVA_PATH=${JAVA_HOME}/bin:${JRE_HOME}/bin export PATH=$PATH:${JAVA_PATH}Copy the code

• Reload the configuration file

  source /etc/profile
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• Verify that the installation is successful

  java -version
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• If the following information is displayed, the installation is successful

  [root@iZ8vbeak6j8zpan8owflsyZ mydata]# java -version
  java version "1.8.0_301"
  Java(TM) SE Runtime Environment (build 1.8.0_301-b09)
  Java HotSpot(TM) 64-Bit Server VM (build 25.301-b09, mixed mode)
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4. Nginx installation

• Download and install the Linux installation package nginx.org/en/download…

• Nginx relies on the GCC compilation environment, so you need to install a compilation environment to enable Nginx to compile.

  yum install gcc-c++
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• The HTTP module of Nginx needs to use PCRE to parse regular expressions. Pcre needs to be installed

  yum install -y pcre pcre-devel
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• Install the dependent decompression package

  yum install -y zlib zlib-devel
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• The SSL function requires the OpenSSL library. Install OpenSSL

  yum install -y openssl openssl-devel
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• Compile the installation

  • Go to the nginx directory

    cd /mydata/nginx
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  • Execute the command

    ./configure
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  • Run the make command

    make
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  • Run the make install command

    make install
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• The default installation is /usr/local/nginx

• Start the

  ./usr/local/nginx/sbin/nginx
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• If the welcome page is displayed after you access the IP address, the installation is successful

If the access is not successful, check and disable the firewall

• Checking the Firewall Status

systemctl status firewalld.service
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• Disabling the Firewall

systemctl stop firewalld.service
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• Permanently Disable the Firewall

systemctl disable firewalld.service
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5. Install tomcat

• Download and install the Linux installation package

• Unpack the

  Tar ZXVF - apache tomcat - 9.0.50. Tar. GzCopy the code

• Start the

  ./mydata/tomcat9/bin/startup.sh
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• Check whether the installation is successful. Port 8080 is started by default. If the welcome page is displayed, the installation is successful

6. InstallationMySQL

6.1 Manually Installing version 5.7

In order to build quickly, I used Docker installation, which will be introduced later.

• Installing version 5.7

  • wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
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  • yum -y install mysql57-community-release-el7-10.noarch.rpm
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  • yum -y install mysql-community-server
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  • systemctl start mysqld.service
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  • Viewing the Default Password

    grep "password" /var/log/mysqld.log
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  • Mysql -uroot -p (note: Enter the default password)Copy the code

  • set global validate_password_policy=0;
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  • set global validate_password_length=1;
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  • ALTER USER 'root'@'localhost' IDENTIFIED BY 'your new password '; (Note: Change your new password here)Copy the code

• The mysql configuration file is stored in /etc/my.cnf by default

  You are advised to change the default port number

  Modify port=3666 in configuration file

• Uninstall MySQL

  • See what files are available

    rpm -qa|grep -i mysql
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  • Unload one by one

    Yum removeCopy the code

  • Delete some legacy files

    find / -name mysql
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  • Delete one by one

    Rm - rf filesCopy the code

6.2 Docker installation version 8.0

There are many people on the Internet to share, but it is just a simple installation, there are many pits did not mention, must be in my order to operate, can effectively avoid pits.

• Download the image file (latest version 8.0 by default)

docker pull mysql
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• Run the container

Docker run -itd --name mysql8.0 \ -p 3306:3306 \ -e MYSQL_ROOT_PASSWORD=123456 mysqlCopy the code

• Copy all files to be mounted to the local PC

mkdir -p /mydata/mysql/conf mkdir -p /mydata/mysql/logs mkdir -p /mydata/mysql/data mkdir -p /mydata/mysql/mysql-files Docker cp mysql8.0: / etc/mysql/my CNF/mydata/mysql/conf/my CNF docker cp mysql8.0: / etc/mysql/conf. D /mydata/mysql/conf/conf.dCopy the code

There is a small hole here. Do not change the permission of the configuration file. Otherwise, the configuration will not take effect. I was chMOD 777 at the time, and it didn’t work anyway, and then I read the log to solve it bit by bit.

• Remove the container

Docker stop mysql8.0 docker rm mysql8.0Copy the code

• Rerun the container and mount it

Docker run - itd - name mysql8.0 \ -p 3306: \ 3306 - v/mydata/mysql/conf: / etc/mysql \ v/mydata/mysql/logs: / logs \ - v /mydata/mysql/data:/var/lib/mysql \ -v /mydata/mysql/mysql-files:/var/lib/mysql-files \ -e MYSQL_ROOT_PASSWORD=root@123456 mysqlCopy the code

• Restart the

Docker restart mysql8.0Copy the code

7. Install Redis

Juejin. Cn/post / 700111…

## background run
daemonize yes
## Extranet connection
protected-mode no
#Only local connections are allowed
# bind 127.0.0.1
## port
port 6666
## connect password
requirepass 123456
#Set database total
databases 256
## log file
logfile ./redislog.log
#Set the data file storage directoryDir/usr/local/redis - 6.0.6Copy the code

8. GitLab installation

• Downloading the image File

  docker pull docker.io/gitlab/gitlab-ce
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• Create a mount directory

  mkdir -p /var/gitlab/etc
  mkdir -p /var/gitlab/log
  mkdir -p /var/gitlab/data
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• Start the container

  Docker run \ --detach \ --publish 2222:22 \ --publish 777:7777 \ --publish 844:443 \ --hostname 192.168.10.59 \ -v /var/gitlab/etc:/etc/gitlab \ -v /var/gitlab/log:/var/log/gitlab \ -v /var/gitlab/data:/var/opt/gitlab \ -v /etc/localtime:/etc/localtime:ro \ --name gitlab \ --restart always \ --privileged=true gitlab/gitlab-ce:latestCopy the code

• Modify the/var/gitlab/etc/gitlab.rb

  vi /var/gitlab/etc/gitlab.rb
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  #Modify the HTTPcloneIs displayed
  # external_url 'GENERATED_EXTERNAL_URL'External_url 'http://192.168.0.106:7777'#Modify the SSHcloneIs displayed
  gitlab_rails['gitlab_shell_ssh_port'] = 2222
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• Modify the/var/gitlab/data/gitlab-rails/etc/gitlab.ymlChange the port to the correct port

  vi /var/gitlab/data/gitlab-rails/etc/gitlab.yml
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• Restart gitlab

  docker restart gitlab
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• Example Initialize the administrator password

  • docker exec  -it gitlab /bin/bash
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  • gitlab-rails console
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  • user = User.where(username: 'root').first
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  • user.password='root@123'
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  • user.save
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• Visit the address http://192.168.0.106:7777 login account, create good warehouse, configured account.
• Code synchronization

Synchronize the local code to gitLab

#Local synchronization to remote repository
git push -u origin master
#Switch branch
git checkout uat
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9. The node installation

• Downloading the Installation package

  Wget HTTP: / / https://cdn.npm.taobao.org/dist/node/v14.16.0/node-v14.16.0-linux-x64.tar.xzCopy the code

• Unpack the

  Xz -d node-v14.16.0-linux-x64.tar.xz tar - XVF node-v14.16.0-linux-x64.tarCopy the code

• Set up a soft connection in the /usr/bin directory and make it global

  Ln -s /usr/local/node-node-v14.16.0 -linux-x64/bin/node /usr/local/bin/node ln -s / usr/local/node/node - v14.16.0 - Linux - x64 / bin/NPM/usr/local/bin/NPMCopy the code

• Verify that the installation is successful

  node -v
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• Install CNPM

  npm install -g cnpm --registry=https://registry.npm.taobao.org
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• Creating a Soft connection

  Ln -s/usr/local/node/node - v14.16.0 - Linux - x64 / bin/CNPM/usr/local/bin/CNPMCopy the code

• Verifying the Installation

cnpm -v
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• Switch to taobao source image

  npm install yarn -g
  #Creating a Soft connectionLn -s/usr/local/node/node - v14.16.0 - Linux - x64 / bin/yarn/usr/local/bin/yarn#View the current source address
  yarn config get registry
  #Switch to Taobao Source
  yarn config set registry https://registry.npm.taobao.org/
  #Check whether the switchover is successful
  yarn config get registry
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10. Jenkins installation

• Downloading the image File

  docker pull jenkins/jenkins
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• Create a mount folder to view configuration and data information

  mkdir -p /var/jenkins_mount
  chmod 777 /var/jenkins_mount
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• Start the container

  docker run -d -p 8080:8080 \ -p 50000:50000 \ -v /var/jenkins_mount:/var/jenkins_home \ -v / mydata jdk1.8.0 _301: / var/jdk1.8.0 _301 \ v/usr/share/maven: / var/maven \ - v/etc/localtime: / etc/localtime \ -- the name jenkins jenkins/jenkinsCopy the code

• Modify Jenkins software download image

  vi  /var/jenkins_mount/hudson.model.UpdateCenter.xml
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  <? The XML version = '1.1' encoding = "utf-8"? > <sites> <site> <id>default</id> <url>https://updates.jenkins.io/update-center.json</url> </site> </sites>Copy the code

Amend the url to tsinghua university official mirror address: mirrors.tuna.tsinghua.edu.cn/jenkins/upd…

<? The XML version = '1.1' encoding = "utf-8"? > <sites> <site> <id>default</id> <url>https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/update-center.json</url> </site> </sites>Copy the code

• Reboot it, Jenkins.

  docker restart jenkins 
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• Visit Jenkins to view the password

  cat /var/jenkins_mount/secrets/initialAdminPassword
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• Set the account as prompted

• Installation of related Applications

  • maven

  yum install maven
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  • git

  yum install git
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  • Maven Automatic Installation
  • The JDK bring

  [root@localhost jenkins_mount]# docker exec -it jenkins /bin/bash
  jenkins@d9218f4c506e:/$ echo $JAVA_HOME
  /opt/java/openjdk
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  • Automatic installation of the JDK can also be used

  Maven uses automatic downloads, whereas the JDK uses mount

  • Install the plug-in Nodejs
    • Set up the INSTALLATION of CNPM in global configuration
    • In the job configuration to build the environment, select Provide Node & NPM bin/ Folder to PATH and specify the version to be automatically installed

• Configure the SSH remote connection

Configure the connection to the server

• Jenkins time is not allowed to change

System.setProperty('org.apache.commons.jelly.tags.fmt.timeZone'.'Asia/Shanghai')
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11. Nginx installation and configuration

• Download decompression (limited space, simple operation, not detailed introduction here)
• Address concatenation removes prefix API

location ^~/api/ {
       	    proxy_set_header Host $host;
            proxy_set_header  X-Real-IP        $remote_addr;
            proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;
            proxy_set_header  X-NginX-Proxy true;
	
            proxy_pass http://192.168.0.106:8090/;
    	}
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• Rewrite the prefix removal API/)

location ^~/api/ {
        proxy_set_header Host $host;
        proxy_set_header  X-Real-IP        $remote_addr;
        proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_set_header X-NginX-Proxy true;

        rewrite ^/order/(.*)$ /$1 break;
        proxy_pass http://192.168.0.106:8090/api;
    }
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server { listen 1111; server_name localhost; location / { root html/erp-web-uat; index index.html index.htm; } location ^~/api/ { proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-NginX-Proxy true; Proxy_pass http://192.168.0.106:8091/; } error_page 500 502 503 504 /50x.html; location = /50x.html { root html; }}Copy the code

12. Zen Installation

• Downloading the image File

  docker pull easysoft/zentao
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• Create a Docker network driver

  Docker network create --subnet=172.172.172.0/24 ZentaonetCopy the code

• Create a mount directory

  mkdir -p /mydata/chandao/zentaopms
  mkdir -p /mydata/chandao/mysqldata
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• Activate the Zen path container

  docker run --name zentao \
              -p 9000:80 \
              -v /mydata/chandao/zentaopms:/www/zentaopms \
              -v /mydata/chandao/mysqldata:/var/lib/mysql \
              -d easysoft/zentao
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• View the IP address inside the container

The goal is not to use Zen Dao’s own internal database, but to use our own services

    docker network inspect bridge
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Is commonly 172.172.172. * * *

• Set the password mode for database connection

  [mysqld]
  default-authentication-plugin=mysql_native_password
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• An address resolution error may occur

  [mysqld]
  skip-name-resolve
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• If that still doesn’t work, modify the database connection

  select host,user,plugin,authentication_string from mysql.user
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  %	root	mysql_native_password	*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9
  localhost	mysql.infoschema	caching_sha2_password	$A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED
  localhost	mysql.session	caching_sha2_password	$A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED
  localhost	mysql.sys	caching_sha2_password	$A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED
  localhost	root	caching_sha2_password	$A$005$tOo""SB	y@fnlVu3WzwZGqrggMqgcCWpJ3Ru16Cnc/mUdtceS/SStUCea3
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  ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456';
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After modifying the configuration, restart the device and try again

13. Configure multiple environments

13.1 the Tomcat configuration

<Service name="ERP_UAT">
    <Connector port="8091" protocol="HTTP / 1.1"
               connectionTimeout="20000"
               redirectPort="8443" />
    <Engine name="ERP_UAT" defaultHost="localhost">

      <Realm className="org.apache.catalina.realm.LockOutRealm">
        <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
               resourceName="UserDatabase"/>
      </Realm>
      <Host name="localhost"  appBase="erp_uat"
            unpackWARs="true" autoDeploy="true">
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs/erp_uat"
               prefix="localhost_access_log" suffix=".txt"
               pattern="%h %l %u %t &quot;%r&quot; %s %b" />
      </Host>
    </Engine>
</Service>

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conclusion

Here is basically a complete recovery, fortunately, the deletion is only a test environment, lessons learned, in the future when operating delete command must be more careful.