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Message #46849
[Bug 1815101] Re: [master] Restarting systemd-networkd breaks keepalived, heartbeat, corosync, pacemaker (interface aliases are restarted)
As discussed in
https://bugs.launchpad.net/ubuntu/+source/keepalived/+bug/1819074 and
pointed out in
https://bugs.launchpad.net/ubuntu/bionic/+source/keepalived/+bug/1815101/comments/65,
as KeepConfiguration= is part of systemd nowadays, and since the
keepalived fix is available since 2.x, This should be fixed nowadays,
and I am marking the keepalived task as such.
** Tags removed: server-todo
** Changed in: keepalived (Ubuntu)
Status: In Progress => Fix Released
** Changed in: keepalived (Ubuntu)
Assignee: Athos Ribeiro (athos-ribeiro) => (unassigned)
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https://bugs.launchpad.net/bugs/1815101
Title:
[master] Restarting systemd-networkd breaks keepalived, heartbeat,
corosync, pacemaker (interface aliases are restarted)
Status in netplan:
Triaged
Status in heartbeat package in Ubuntu:
Won't Fix
Status in keepalived package in Ubuntu:
Fix Released
Status in systemd package in Ubuntu:
Fix Released
Status in systemd source package in Xenial:
Won't Fix
Status in keepalived source package in Bionic:
Won't Fix
Status in systemd source package in Bionic:
Fix Released
Status in systemd source package in Disco:
Won't Fix
Status in systemd source package in Eoan:
Fix Released
Status in keepalived source package in Focal:
Confirmed
Status in systemd source package in Focal:
Fix Released
Bug description:
[impact]
- ALL related HA software has a small problem if interfaces are being
managed by systemd-networkd: nic restarts/reconfigs are always going
to wipe all interfaces aliases when HA software is not expecting it to
(no coordination between them.
- keepalived, smb ctdb, pacemaker, all suffer from this. Pacemaker is
smarter in this case because it has a service monitor that will
restart the virtual IP resource, in affected node & nic, before
considering a real failure, but other HA service might consider a real
failure when it is not.
[test case]
- comment #14 is a full test case: to have 3 node pacemaker, in that
example, and cause a networkd service restart: it will trigger a
failure for the virtual IP resource monitor.
- other example is given in the original description for keepalived.
both suffer from the same issue (and other HA softwares as well).
[regression potential]
- this backports KeepConfiguration parameter, which adds some
significant complexity to networkd's configuration and behavior, which
could lead to regressions in correctly configuring the network at
networkd start, or incorrectly maintaining configuration at networkd
restart, or losing network state at networkd stop.
- Any regressions are most likely to occur during networkd start,
restart, or stop, and most likely to involve missing or incorrect ip
address(es).
- the change is based in upstream patches adding the exact feature we
needed to fix this issue & it will be integrated with a netplan change
to add the needed stanza to systemd nic configuration file
(KeepConfiguration=)
[other info]
original description:
---
Configure netplan for interfaces, for example (a working config with
IP addresses obfuscated)
network:
ethernets:
eth0:
addresses: [192.168.0.5/24]
dhcp4: false
nameservers:
search: [blah.com, other.blah.com, hq.blah.com, cust.blah.com, phone.blah.com]
addresses: [10.22.11.1]
eth2:
addresses:
- 12.13.14.18/29
- 12.13.14.19/29
gateway4: 12.13.14.17
dhcp4: false
nameservers:
search: [blah.com, other.blah.com, hq.blah.com, cust.blah.com, phone.blah.com]
addresses: [10.22.11.1]
eth3:
addresses: [10.22.11.6/24]
dhcp4: false
nameservers:
search: [blah.com, other.blah.com, hq.blah.com, cust.blah.com, phone.blah.com]
addresses: [10.22.11.1]
eth4:
addresses: [10.22.14.6/24]
dhcp4: false
nameservers:
search: [blah.com, other.blah.com, hq.blah.com, cust.blah.com, phone.blah.com]
addresses: [10.22.11.1]
eth7:
addresses: [9.5.17.34/29]
dhcp4: false
optional: true
nameservers:
search: [blah.com, other.blah.com, hq.blah.com, cust.blah.com, phone.blah.com]
addresses: [10.22.11.1]
version: 2
Configure keepalived (again, a working config with IP addresses
obfuscated)
global_defs # Block id
{
notification_email {
sysadmins@xxxxxxxx
}
notification_email_from keepalived@xxxxxxxxxxxxxxxxxxx
smtp_server 10.22.11.7 # IP
smtp_connect_timeout 30 # integer, seconds
router_id system3 # string identifying the machine,
# (doesn't have to be hostname).
vrrp_mcast_group4 224.0.0.18 # optional, default 224.0.0.18
vrrp_mcast_group6 ff02::12 # optional, default ff02::12
enable_traps # enable SNMP traps
}
vrrp_sync_group collection {
group {
wan
lan
phone
}
vrrp_instance wan {
state MASTER
interface eth2
virtual_router_id 77
priority 150
advert_int 1
smtp_alert
authentication {
auth_type PASS
auth_pass BlahBlah
}
virtual_ipaddress {
12.13.14.20
}
}
vrrp_instance lan {
state MASTER
interface eth3
virtual_router_id 78
priority 150
advert_int 1
smtp_alert
authentication {
auth_type PASS
auth_pass MoreBlah
}
virtual_ipaddress {
10.22.11.13/24
}
}
vrrp_instance phone {
state MASTER
interface eth4
virtual_router_id 79
priority 150
advert_int 1
smtp_alert
authentication {
auth_type PASS
auth_pass MostBlah
}
virtual_ipaddress {
10.22.14.3/24
}
}
At boot the affected interfaces have:
5: eth4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether ab:cd:ef:90:c0:e3 brd ff:ff:ff:ff:ff:ff
inet 10.22.14.6/24 brd 10.22.14.255 scope global eth4
valid_lft forever preferred_lft forever
inet 10.22.14.3/24 scope global secondary eth4
valid_lft forever preferred_lft forever
inet6 fe80::ae1f:6bff:fe90:c0e3/64 scope link
valid_lft forever preferred_lft forever
7: eth3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether ab:cd:ef:b0:26:29 brd ff:ff:ff:ff:ff:ff
inet 10.22.11.6/24 brd 10.22.11.255 scope global eth3
valid_lft forever preferred_lft forever
inet 10.22.11.13/24 scope global secondary eth3
valid_lft forever preferred_lft forever
inet6 fe80::ae1f:6bff:feb0:2629/64 scope link
valid_lft forever preferred_lft forever
9: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether ab:cd:ef:b0:26:2b brd ff:ff:ff:ff:ff:ff
inet 12.13.14.18/29 brd 12.13.14.23 scope global eth2
valid_lft forever preferred_lft forever
inet 12.13.14.20/32 scope global eth2
valid_lft forever preferred_lft forever
inet 12.33.89.19/29 brd 12.13.14.23 scope global secondary eth2
valid_lft forever preferred_lft forever
inet6 fe80::ae1f:6bff:feb0:262b/64 scope link
valid_lft forever preferred_lft forever
Run 'netplan try' (didn't even make any changes to the configuration) and the keepalived addresses disappear never to return, the affected interfaces have:
5: eth4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether ab:cd:ef:90:c0:e3 brd ff:ff:ff:ff:ff:ff
inet 10.22.14.6/24 brd 10.22.14.255 scope global eth4
valid_lft forever preferred_lft forever
inet6 fe80::ae1f:6bff:fe90:c0e3/64 scope link
valid_lft forever preferred_lft forever
7: eth3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether ab:cd:ef:b0:26:29 brd ff:ff:ff:ff:ff:ff
inet 10.22.11.6/24 brd 10.22.11.255 scope global eth3
valid_lft forever preferred_lft forever
inet6 fe80::ae1f:6bff:feb0:2629/64 scope link
valid_lft forever preferred_lft forever
9: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether ab:cd:ef:b0:26:2b brd ff:ff:ff:ff:ff:ff
inet 12.13.14.18/29 brd 12.13.14.23 scope global eth2
valid_lft forever preferred_lft forever
inet 12.33.89.19/29 brd 12.13.14.23 scope global secondary eth2
valid_lft forever preferred_lft forever
inet6 fe80::ae1f:6bff:feb0:262b/64 scope link
valid_lft forever preferred_lft forever
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