Keepalived ist eine Software um Hochverfügbarkeit in Linux Umgebungen zu gewährleisten. Keepalived verwendet u.a [[VRRP]] ([[https://docs.linuxfabrik.ch/software/keepalived.html#vrrp-advertisement]])

{{vrrp.jpeg}}

=====Installation=====

<box red>Um Prozesse etc. zu überwachen braucht man mind. Version 2.0, die muss man selbst kompilieren.</box>

<code>
sudo apt install -y keepalived
</code>

Die Konfig liegt unter

<code>
/etc/keepalived/keepalived.conf
</code>

====Selbst Kompilieren====

===Ubuntu===

Das Github Repo verwendet autoconf.

<code>
sudo apt install build-essential libssl-dev libnl-3-dev libnl-genl-3-dev autoconf automake libtool

git clone https://github.com/acassen/keepalived.git
cd keepalived

./autogen.sh
./configure

make
sudo make install

sudo keepalived -v
</code>

<box red>Service Unit anlegen!!!</box>

<code>
sudo nano /etc/systemd/system/keepalived.service
</code>

<code>
[Unit]
Description=Keepalived Daemon
After=network.target

[Service]
Type=simple
ExecStart=/usr/local/sbin/keepalived --dont-fork --log-console
Restart=always

[Install]
WantedBy=multi-user.target
</code>

<code>
sudo systemctl daemon-reexec
sudo systemctl daemon-reload
sudo systemctl enable keepalived
sudo systemctl start keepalived
</code>

===Alma Linux 8===

<code>
dnf install -y gcc make openssl-devel libnl3-devel autoconf automake libtool git

git clone https://github.com/acassen/keepalived.git
cd keepalived

./autogen.sh
./configure
make 
sudo make install
</code>

<code>
sudo nano /etc/systemd/system/keepalived.service
</code>

<code>
[Unit]
Description=Keepalived Daemon
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
ExecStart=/usr/local/sbin/keepalived --dont-fork --log-console
ExecReload=/bin/kill -HUP $MAINPID
Restart=always

[Install]
WantedBy=multi-user.target
</code>
=====Konfiguration=====

====Master====

<code>
vrrp_instance VI_1 {
    state MASTER
    interface ens160
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass geheim
    }
    virtual_ipaddress {
        172.21.0.166
    }
}
</code>

====Backup====

<code>
vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass geheim
    }
    virtual_ipaddress {
        172.21.0.166
    }
}
</code>

=====Health=====

Man kann Prozesse, Dateien, Interfaces und eigene Scripte "tracken".

====Prozesse====

Siehe [[https://docs.linuxfabrik.ch/software/keepalived.html#prozesse-mit-keepalived-tracken]]. 

<box red>Funktioniert erst ab Version 2.0! Muss man selber kompilieren.</box>

====Dateien====

Siehe [[https://docs.linuxfabrik.ch/software/keepalived.html#dateien-mit-keepalived-tracken]]

====Interfaces====

Siehe [[https://docs.linuxfabrik.ch/software/keepalived.html#interfaces-mit-keepalived-tracken]]

====Scripts====

Siehe [[https://docs.linuxfabrik.ch/software/keepalived.html#scripts-mit-keepalived-tracken]]

====Notifications====

  * [[https://docs.linuxfabrik.ch/software/keepalived.html#notifications]]