I want to lead an easy life.

sudo apt update
sudo apt upgrade
sudo apt install net-tools

sudo vi /etc/ssh/sshd_config.d/60-cloudimg-settings.conf
下記の通り修正

PasswordAuthentication yes

sudo vi /etc/netplan/50-cloud-init.yaml
下記の通り修正

network:
    ethernets:
        eth0:
            dhcp4: false
            dhcp6: false
            addresses: [ローカルIP/24] #設定したIPは機器ごとに後で変更すること
            routes:
                - to: default
                  via: ゲートウェイIP #無いならroutesの設定いらない
            nameservers:
                addresses: [8.8.8.8, 8.8.4.4]
    version: 2

sudo netplan try
sudo vi /etc/cloud/cloud.cfg
下記の通り修正

preserve_hostname: true

sudo hostnamectl set-hostname rp1 #設定したホスト名は機器ごとに後で変更すること

sudo apt install nginx
sudo systemctl start nginx
sudo systemctl enable nginx
sudo vi /etc/nginx/nginx.conf
下記の通り修正

worker_connections 16;

sudo rm /etc/nginx/sites-enabled/default
sudo vi /etc/nginx/conf.d/loadbalancer.conf
下記の通り新規作成

upstream backend {
    #least_conn;
    #ip_hash; #設定しても良いが、ラウンドロビンされていることを直ぐに確認したいので今回はなし
    server Reverse Proxy Server No.1のIP:80;
    server Reverse Proxy Server No.2のIP:80;
}

server {
    listen 80 default_server;
    server_name _;

    location / {
        proxy_pass http://backend;
    }
}

sudo nginx -t
sudo systemctl restart nginx

sudo apt install nginx
sudo systemctl start nginx
sudo systemctl enable nginx
sudo vi /etc/nginx/nginx.conf
下記の通り修正

worker_connections 16;

sudo rm /etc/nginx/sites-enabled/default
sudo vi /etc/nginx/conf.d/proxy.conf
下記の通り新規作成

server {
    listen 80 default_server;
    server_name _;

    location / {
        proxy_pass http://Application Server1のIP:8080;
    }
}

sudo nginx -t
sudo systemctl restart nginx

sudo apt install openjdk-21-jdk

cd /opt
sudo tar xvfz /mnt/nfs/apache-tomcat-10.1.20.tar.gz
sudo ln -s /opt/apache-tomcat-10.1.20 tomcat
sudo useradd -m -U -d /opt/tomcat -s /bin/false tomcat
sudo chown -R tomcat: /opt/apache-tomcat-10.1.20

sudo vi /usr/lib/systemd/system/tomcat.service
下記の通り新規作成

#
# Systemd unit file for Apache Tomcat
#
[Unit]
Description=Apache Tomcat 10 Web Application Server
After=network.target
[Service]
# Configuration
Environment="JAVA_OPTS=-Djava.awt.headless=true"
Environment="CATALINA_BASE=/opt/tomcat"
Environment="CATALINA_HOME=/opt/tomcat"
Environment="CATALINA_OPTS=-Xmx1024m -server"
Environment="CATALINA_PID=/opt/tomcat/temp/tomcat.pid"
# Lifecycle
Type=forking
ExecStart=/opt/tomcat/bin/startup.sh
ExecStop=/opt/tomcat/bin/shutdown.sh
Restart=always
PIDFile=/opt/tomcat/temp/tomcat.pid
# Logging
SyslogIdentifier=tomcat
# Security
User=tomcat
Group=tomcat
[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload
sudo systemctl start tomcat

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
         channelSendOptions="6">
  <Manager className="org.apache.catalina.ha.session.BackupManager"
           expireSessionsOnShutdown="false"
           notifyListenersOnReplication="true"
           mapSendOptions="6"/>
  <Channel className="org.apache.catalina.tribes.group.GroupChannel">
    <Membership className="org.apache.catalina.tribes.membership.McastService"
                address="228.0.0.4"
                port="45564"
                frequency="500"
                dropTime="3000"/>
    <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
              address="auto"
              port="5000"
              selectorTimeout="100"
              maxThreads="6"/>

    <Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
      <Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
    </Sender>
    <Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
    <Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor"/>
    <Interceptor className="org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor"/>
  </Channel>

  <Valve className="org.apache.catalina.ha.tcp.ReplicationValve" filter=""/>

  <ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
</Cluster>

sudo apt install mariadb-server
sudo systemctl stop mariadb
sudo mkdir /mnt/ssd/mariadb

sudo vi /etc/mysql/mariadb.conf.d/50-server.cnf
下記の通り修正

datadir                 = /mnt/ssd/mariadb
#bind-address            = 127.0.0.1

sudo vi /etc/apparmor.d/tunables/alias
下記の通り修正

alias /var/lib/mysql/ -> /mnt/ssd/mariadb/,

sudo systemctl restart apparmor
sudo rsync -avuz /var/lib/mysql/ /mnt/ssd/mariadb

sudo systemctl start mariadb
sudo mysql_secure_installation
Enter current password for root (enter for none):
Switch to unix_socket authentication [Y/n] n
Change the root password? [Y/n] 
New password:
Re-enter new password:
Remove anonymous users? [Y/n] y
Disallow root login remotely? [Y/n] n
Remove test database and access to it? [Y/n] y
Reload privilege tables now? [Y/n] y

mysql -u root -p
grant all privileges on *.* to root@"%" identified by 'password' with grant option;
exit;

sudo systemctl restart mariadb

sudo systemctl disable mariadb
sudo mkdir -p /mnt/ssd/log/mariadb
sudo chown -R mysql: /mnt/ssd/log/mariadb
sudo vi /etc/mysql/mariadb.conf.d/50-server.cnf
下記の通り修正

server-id               = 1 # サーバー毎に変更
log_bin                 = /mnt/ssd/log/mariadb/mariadb-bin.log

sudo vi /etc/mysql/mariadb.conf.d/60-galera.cnf
下記の通り修正

[galera]
# Mandatory settings
wsrep_on                 = ON
wsrep_cluster_name       = "MariaDB Galera Cluster"
wsrep_cluster_address    = gcomm://サーバーIP1,サーバーIP2,サーバーIP3
binlog_format            = row
default_storage_engine   = InnoDB
innodb_autoinc_lock_mode = 2
wsrep_provider           = /usr/lib/galera/libgalera_smm.so

# Allow server to accept connections on all interfaces.
bind-address = 0.0.0.0

sudo galera_new_cluster

sudo less /mnt/ssd/mariadb/grastate.dat

# GALERA saved state
version: 2.1
uuid:    xxx
seqno:   -1
safe_to_bootstrap: 1