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]# nmtui [root@icecube network-scripts]# nmtuinmcli -f NAME,DEVICE con show --active^C [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]# 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
   inet6 fe80::a00:27ff:fef3:3c51/64 scope link noprefixroute
      valid_lft forever preferred_lft forever

[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]#