LinuxTips(RedHat)_en Terminate the process
To terminate a running process, use the kill command.You nee...
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LinuxTips(RedHat)_en 
Ubuntu18.04_en Ubuntu Server 18.04 : Obtaining and Installing an Image
Download the installation imageThe installation media for Ubuntu Server can be downloaded from the official website on the Internet.You will need to create an installation CD/DVD from the downloaded iso file.The download location for the iso file isUbuntu official download siteInstallChange the BIOS so that the PC can boot from the installation disk created above, and then boot the PC.
Ubuntu18.04_en Ubuntu Server 18.04 : Installing MySQL
Installing MySQL1.Install the necessary packages.# apt update# apt install mysql-server2.Configure security settings for MySQL server.There is a tool called mysql_secure_installtion that can be used to configure security-related settings for the MySQL server.When you run it, it will ask you a series of questions to help you configure some security settings.
Ubuntu18.04_en Ubuntu Server : 18.04 Initial Setup
1. Set the root password and use the SU command$ passwd rootpassword for ← Current user's passwordEnter new UNIX password: ← Enter the root password to be set.Retype new UNIX password: ← Re-enter the same passwordpasswd: password updated successfully
Ubuntu18.04_en Ubuntu Server 18.04 : FTP Serve , NTP Server
1.Install the FTP server vsftpd① Install# apt install vsftpd② Allow PORT21 to be used by FTP in UFW(firewall)# ufw allow ftp# ufw reload③ Edit the configuration file (vsftpd.conf)
Ubuntu18.04_en Ubuntu Server 18.04 : Web server and antivirus installed.
1. WEB server installation1. 1 Apache2 installation① Install# apt -y install apache2② Edit configuration file# vi /etc/apache2/conf-enabled/security.conf# Line 25: ChangeServerTokens Prod
Ubuntu18.04_en Ubuntu Server 18.04 : Mail Server Install
1.Postfix : Installation / ConfigurationPostfix is a software developed as an MTA (Mail Transport Agent) to replace Sendmail, and is a mail server with features such as high compatibility with Sendmail, security, easy maintenance, and speed.Also, since Postfix only functions as an SMTP server for sending mails, you will need to install a POP server for receiving mails separately as described later.
Ubuntu18.04_en Ubuntu Server 18.04 : Obtain an SSL certificate (Let's Encrypt).
Obtaining a certificate with Let's Encrypt①Enable mod_ssl# a2enmod ssl②Install Git.# apt-get install -y git③Install the certificate acquisition tool# cd /usr/local/# git clone https://github.com/certbot/certbot
Ubuntu18.04_en Ubuntu Server 18.04 : SSL/TLS applied to web , mail , FTP server
1. Apache2 : SSL/TLS ConfigurationDescribes how to apply an SSL certificate obtained with Let's Encrypt to apache.Domain name : hoge.com1.1 Configuration of Apache2①Editing the Apache2 configuration fileRename and copy the default conf file (e.g. "hoge.com-ssl.conf")
LinuxTips(RedHat)_en Display various information about the CPU
●Display the CPU information installed on the PC.To display the CPU information installed in the PC, refer to the "/proc/cpuinfo" file.This information is used to know the CPU load for top command, etc.
LinuxTips(RedHat)_en Configuring the default gateway (router)
●Confirmation of the current default gatewayExecute the "route -n" command. "-n" is an option to display the hostname as IP.●Remove the default gatewaySet "del" as the argument of the route command, and set the IP address of the default gateway device (192.168.11.1) that you want to delete after "default gw".●Setting up a new default gatewaySet "add" as the argument of the route command, and set the IP address (192.168.11.2) of the default gateway device you want to set after "default gw".