Multipath

Configurar Multipath

Introducción

Continuando con anteriores LABs vamos a implementar Multipath, sobre iSCSI en el Pacemaker que configuramos aqui Pacemaker .

Aunque el orden correcto para montar esta infraestructura deberia ser la siguiente, vamos a implementar el Multipath ahora para mejorar la capa HA.

• iSCSI
• multipath
• LVM
• filesystem
• cluster (si aplica)

Requisitos Previos

Para usar multipath se necesita que las LUNs venga por varios Paths, por tanto es imprescindible tener dos IP en el iSCSI target:

[root@icecube network-scripts]# nmcli
enp0s3: connected to enp0s3
        "Intel 82540EM"
        ethernet (e1000), 08:00:27:F3:3C:51, hw, mtu 1500
        ip4 default
        inet4 192.168.1.80/24
        route4 192.168.1.0/24 metric 100
        route4 default via 192.168.1.1 metric 100
        inet6 fe80::a00:27ff:fef3:3c51/64
        route6 fe80::/64 metric 1024

lo: connected (externally) to lo
        "lo"
        loopback (unknown), 00:00:00:00:00:00, sw, mtu 65536
        inet4 127.0.0.1/8
        inet6 ::1/128
        route6 ::1/128 metric 256

DNS configuration:
        servers: 8.8.8.8
        interface: enp0s3

Use "nmcli device show" to get complete information about known devices and
"nmcli connection show" to get an overview on active connection profiles.

Consult nmcli(1) and nmcli-examples(7) manual pages for complete usage details.

[root@icecube network-scripts]# nmcli -f NAME,DEVICE con show --active
NAME    DEVICE
enp0s3  enp0s3
lo      lo

[root@icecube network-scripts]# nmcli con mod enp0s3 +ipv4.addresses 192.168.1.79/24

[root@icecube network-scripts]# nmcli device reapply enp0s3
Connection successfully reapplied to device 'enp0s3'.

[root@icecube network-scripts]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:f3:3c:51 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.80/24 brd 192.168.1.255 scope global noprefixroute enp0s3
       valid_lft forever preferred_lft forever
    inet 192.168.1.79/24 brd 192.168.1.255 scope global secondary noprefixroute enp0s3
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fef3:3c51/64 scope link noprefixroute
       valid_lft forever preferred_lft forever
[root@icecube network-scripts]#