業務用エアコン関連の技術情報、エラーコード、環境問題対策に関する別サイト「エアコンの安全な修理･適切なフロン回収」

nuy

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.
2020.02.02
Ubuntu18.04_en
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
2020.01.31
Ubuntu18.04_en
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)
2020.01.29
Ubuntu18.04_en
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
2020.01.29
Ubuntu18.04_en
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.
2020.09.24
LinuxTips(RedHat)_ensystems-management
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".
2020.09.26
LinuxTips(RedHat)_enNetwork Management
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
2020.02.03
Ubuntu18.04_en