FR12 introduce basic support for comma-separated list of management
servers for agents, while makes an explicit LB unnecessary.
On the agent side, the 'host' is saved as:
<comma separated addresses>@<algorithm name>.
Where the algorithm name is the name of the lb algorithm. The
This FR introduces two new global settings:
- indirect.agent.lb.algorithm: The algorithm for the indirect agent LB.
- indirect.agent.lb.check.interval: The preferred host check interval
for the agent's background task that checks and switches to agent's
preferred host.
Any changes to the above two global settings and the 'host' setting does
not require restarting of the management server(s).
The indirect.agent.lb.algorithm supports following algorithm options:
- static: use the list as provided.
- roundrobin: evenly spreads hosts across management servers.
- shuffle: (pseudo) randomly sorts the list (not recommended for production).
From the agent's perspective, the first address in the propagated list
will be considered the preferred host. A new background task can be
activated by configuring the indirect.agent.lb.check.interval which is
a cluster level global setting from CloudStack or admins can override
this by configuring the 'host.lb.check.interval' in the host's
agent.properties file.
Comma-separated management server list is propagated to agents on
following cases:
- Addition of a host (including ssvm, cpvm systevms).
- Connection or reconnection by the agents to a management server.
- After admin changes the 'host' and/or the
'indirect.agent.lb.algorithm' global settings.
First the agent connects to the management server and sends its current
management server list, which is compared by the management server and
in case of failure a new/update list is sent for the agent to persist.
Every time agent gets a ms-host list and the algorithm, the host specific
background check interval is also sent and it dynamically reconfigures
the background task without need to restart agents.
The 'static' and 'roundrobin' algorithms, strictly checks for the order
as expected by them, however, the 'shuffle' algorithm just checks for
content and not the order of the comma separate ms host addresses.
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
Implements a VM volume/disk file activity checker that checks if QCOW2 file
has been changed before starting the VM. This is useful as a pessimistic
approach to save VMs that were running on faulty hosts that CloudStack could
try to launch on other hosts while the host was not cleanly fenced. This is
optional and available only if you enable the settings in agent.properties
file, on per-host basis.
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
This improvements checks for "guest.cpu.features" property which is a space
separated list of cpu features that is specific for a host. When added, it
will add <feature policy='require' name='{{feature-you-listed}}'/> in the
<cpu> section of the generated vm spec xml.
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
Detail: lack of newline at end of file was keeping cloudstack-setup-agent from
properly editing/creating new config.
BUG-ID: CLOUDSTACK-1487
Signed-off-by: Marcus Sorensen <marcus@betterservers.com> 1362191198 -0700
The management server also depends on a couple of these scripts, so renaming
to cloud-scripts makes more sence then installing cloud-agent-scripts.
In the future we might want to split this up in two packages.
Rohit Yadav
Kishan Kavala
Marcus Sorensen
JijunLiu
Wido den Hollander
Nitin Mehta
Phong Nguyen
Hugo Trippaers
Wido den Hollander
chip.childers@gmail.com
Edison Su
David Nalley
Edison Su
Edison Su
Manuel Amador (Rudd-O)