Install nats.io server cluster node on rhel clone

nats-install.sh

#!/bin/bash
cd /tmp
wget https://github.com/nats-io/nats-server/releases/download/v2.10.5/nats-server-v2.10.5-amd64.rpm 
yum install -y /tmp/nats-server-v2.10.5-amd64.rpm
rm -rf /tmp/nats-server-v2.10.5-amd64.rpm
useradd -U -M -r -s /sbin/nologin nats
mkdir -p /var/nats
mkdir -p /etc/nats/ssl

cat <<EOF > /etc/nats/nats-server.conf
server_name: nats1.localhost.lcl
client_advertise: nats1.localhost.lcl:4222
# Client port of 4222 on all interfaces
port: 4222

# HTTP monitoring port
monitor_port: 8222

# This is for clustering multiple servers together.
cluster {
  # It is recommended to set a cluster name
  name: "nats-cluster-name"

  pool_size: 6

  # Route connections to be received on any interface on port 6222
  port: 6222

  # Routes are protected, so need to use them with --routes flag
  # e.g. --routes=nats-route://ruser:T0pS3cr3t@otherdockerhost:6222
  authorization {
    user: user
    password: password
    timeout: 2
  }

  # Routes are actively solicited and connected to from this server.
  # This Docker image has none by default, but you can pass a
  # flag to the nats-server docker image to create one to an existing server.
  routes = [
      "nats://user:password@nats1.localhost.lcl:6222",
      "nats://user:password@nats2.localhost.lcl:6222",
      "nats://user:password@nats3.localhost.lcl:6222"
  ]
}

tls {
  cert_file: "/etc/nats/ssl/nats-server.pem"
  key_file: "/etc/nats/ssl/nats-server-key.pem"
  ca_file: "/etc/nats/ssl/ca.pem"
}

# uncomment for logging to file
#debug: false
#trace: false
#logtime: true
#log_file: "/var/nats/nats-server.log"
#logfile_size_limit: 100MB

jetstream {
  store_dir: "/var/nats"
  # 1GB
  max_memory_store: 1073741824
  # 10GB
  max_file_store: 10737418240
}
EOF

cat <<EOF > /etc/systemd/system/nats-server.service
[Unit]
Description=NATS Server
After=network-online.target ntp.service

[Service]
PrivateTmp=true
Type=simple
ExecStart=/usr/bin/nats-server -c /etc/nats/nats-server.conf
ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/bin/kill -s SIGINT $MAINPID
User=nats
Group=nats
# The nats-server uses SIGUSR2 to trigger using Lame Duck Mode (LDM) shutdown
KillSignal=SIGUSR2
# You might want to adjust TimeoutStopSec too.

[Install]
WantedBy=multi-user.target

EOF

cat <<EOF > /etc/nats/ssl/ca.pem
-----BEGIN CERTIFICATE-----
<YOUR SERVER CA CERTIFICATE>
-----END CERTIFICATE-----
EOF

cat <<EOF > /etc/nats/ssl/nats-server.pem
-----BEGIN CERTIFICATE-----
<YOUR SERVER CERTIFICATE>
-----END CERTIFICATE-----
EOF

cat <<EOF > /etc/nats/ssl/nats-server-key.pem
-----BEGIN RSA PRIVATE KEY-----
<YOUR SERVER PRIVATE KEY>
-----END RSA PRIVATE KEY-----
EOF

systemctl daemon-reload
chown -R nats:nats /var/nats
systemctl enable nats-server
firewall-cmd --add-port=6222/tcp --zone=public --permanent
firewall-cmd --add-port=4222/tcp --zone=public --permanent
firewall-cmd --reload