NATS Installation

    1. Execute the below command to download the nats-server binary.

    1. Move the nats-server binary to /usr/local/bin.

    sudo mv nats-server /usr/local/bin/

    1. Make the binary executable.

    sudo chmod +x /usr/local/bin/nats-server

    1. Generate two pairs of NKeys using the nk tool. One pair is for sys user and other for normal user. For a given pair, the key starting with S is the seed key and the one starting with U is the public key. In the nats-server.conf below, you need to paste in the public key of sys user and normal user. Note down the seed key and public key, which will be used in the later parts of installation. Follow this link to install nk tool and generate nkeys https://docs.nats.io/using-nats/nats-tools/nk


    1. Create a nats-server.conf file in /etc directory and make necessary changes.

     Sample nats-server.conf

    host: 0.0.0.0
    port: 4222

    jetstream: enabled

    accounts: {
    sysAcc: {
        users: [
            {nkey: "<SYS_NATS_PUBLIC_KEY>"}
        ],
        exports: [
                {stream: ira.sys.disconnect.>}
        ]
    },
    normal: {
        users: [
                {nkey: "<NORMAL_NATS_PUBLIC_KEY>"}
        ],
        imports: [
                {stream: {account: sysAcc, subject: ira.sys.disconnect.>}}
        ],
        jetstream: enabled
    }
    }

    system_account: sysAcc

    6. Create nats-server.service file in /etc/systemd/system and make necessary configuration changes.

    Sample nats-server.service

    [Unit]
    Description=NATS Server
    After=network-online.target ntp.service

    [Service]
    PrivateTmp=true
    Type=simple
    ExecStart=/usr/local/bin/nats-server -c /etc/nats-server.conf
    ExecReload=/bin/kill -s HUP $MAINPID
    ExecStop=/bin/kill -s SIGINT $MAINPID

    User=root
    Group=root

    Restart=always
    RestartSec=5

    # The nats-server uses SIGUSR2 to trigger using Lame Duck Mode (LDM) shutdown
    KillSignal=SIGUSR2
    # You might want to adjust TimeoutStopSec too.

    LimitNOFILE=800000


    [Install]
    WantedBy=multi-user.target

    7. Enable and start the service.

    sudo systemctl enable nats-server.service
    sudo systemctl daemon-reload
    sudo systemctl start nats-server.service

    8. Check the status of the service and verify if nats is shown as running.

    sudo systemctl status nats-server.service



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