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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

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")

2020.02.03

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