2023-10

Apache2 Install Allow http:80 port and https:443 port in UFW first. 3 Apache2 : Using Perl Scripts Enable CGI to make Perl scripts available ①Perl Install 4 Apache2 : Using PHP Scripts ①PHP Install 5 Apache2 : Virtual Host Settings ①Copy the default configuration file (file name is arbitrary, in this case vhost-yourdomain.conf as an example) and configure the virtual host 6. Digest authentication with Apache2 Since Basic Authentication, a well-known authentication authentication method for http, transmits authentication information in plain text, there is a risk of ID and password leakage if the packet is intercepted. On the other hand, Digest Authentication encrypts the authentication information and sends it in encrypted form, so there is almost no risk of information leakage.

1.Obtain a certificate (Let's Encrypt) 1.1 advance preparation 1.Enable mod_ssl 2.Package management system Snappy installed Let's Encrypt's SSL certificate issuing tool "certbot" is recommended to be installed using "snap" after 2021, so install Snapd first. (It can also be installed using the conventional method with dnf or yum) 1.3 Obtain a Let's Encrypt Certificate It is assumed that a web server such as Apache httpd or Nginx is running. If the web server is not running on the server where the work is to be performed, follow the procedure below under "Obtaining a Let's Encrypt certificate when the web server is not running". It is also assumed that the server on which the work is to be performed (the server with the FQDN of the server from which you want to obtain the certificate) is accessible from the Internet at port 80. 2. SSL/TLS (Let's Encrypt) configuration for Apache2 ①Edit Apache2 SSL-related configuration files 3. SSL/TLS (Let's Encrypt) settings on the mail server 3.1 Obtaining a certificate for the mail server Obtain a certificate for the mail server, but it cannot be obtained in the same way as above, so the following with the "--standalone" option fails.

1. Set root password and use SU command In the default configuration of Ubuntu, the root user is unavailable because no password has been set. By setting a password for the root user, transitions using the traditional [su] command will be possible. 3. Make locate command available The find command is often used to search for specific files throughout the Linux system, but find is somewhat confusing in terms of specifying options. The locate command can extract all files with a specified filename. 5. Network Settings 5.1 Host Name Settings This procedure is not necessary if you have already set the hostname at the time of Ubuntu installation and wish to use the hostname as it is. To change the hostname, use the "hostnamectl set-hostname" command. As an example, we set "ubuntu-10" as the hostname. 5.2 Set IP address to network interface If a fixed IP address was specified during Ubuntu installation, this section is not necessary. To change the IP address, change the " /etc/netplan/00-installer-config.yaml" file, and then restart the network interface (enp0s3 in this environment). The network interface name will change depending on the environment in which the setup was performed, so check the interface name first.