soreana opened a new issue #4093:
URL: https://github.com/apache/cloudstack/issues/4093
##### ISSUE TYPE
* Feature Idea
##### COMPONENT NAME
~~~
Systemvm
~~~
##### CLOUDSTACK VERSION
~~~
It can be merge to 4.14
~~~
##### CONFIGURATION
<!--
Information about the configuration if relevant, e.g. basic network,
advanced networking, etc. N/A otherwise
-->
##### OS / ENVIRONMENT
Used Ubuntu 18:04 as a host for management server and KVM Hypervisor.
##### SUMMARY
As a Cloudstack team, we want to propose centralised logging feature. It
enabled us to access systemvm's log file through management server. We think it
would be interesting for other as well. To better explaining our setup I
depicted the configuration in below picture.
In this case rather than downloading log file manually from systemvms, they
will be available automatically through management server.
### STEPS TO REPRODUCE
Below are configuration files for hypervisor, management server and sytemvms.
#### Hypervisors
Below 4 lines have to uncommented in rsyslog configuration file on each
hypervisor in `/etc/rsyslog.conf`
```Python
module(load="imtcp")
input(type="imtcp" port="514")
module(load="imudp")
input(type="imudp" port="514")
```
Adding below file on each hypervisor to export logs from hypervisor to
management server.
```Java
# cat /etc/rsyslog.d/00-fwd.conf
if ($fromhost-ip startswith '10.' or $fromhost-ip startswith '172.' or
$fromhost-ip startswith '169.') then {
*.* @<Management Server IP>:514
stop
}
```
#### Management Server
Just like hypervisors, below 4 lines have to uncommented in rsyslog
configuration file on management server in `/etc/rsyslog.conf`
```Python
module(load="imtcp")
input(type="imtcp" port="514")
module(load="imudp")
input(type="imudp" port="514")
```
Add below file on management server
```Java
# cat /etc/rsyslog.d/00-remote.conf
$template remote-incoming-logs,"/var/log/rsyslog/%HOSTNAME%/syslog"
$template remote-incoming-logs-combined,"/var/log/rsyslog/remote"
if ($fromhost-ip startswith '10.' or $fromhost-ip startswith '172.') then
?remote-incoming-logs
if ($fromhost-ip startswith '10.' or $fromhost-ip startswith '172.') then
?remote-incoming-logs-combined
& ~
```
#### Systemvm
`00-fwd.conf` file should add on each systemvm as well to export logs from
systemvms to hypervisors.
```Java
# cat /etc/rsyslog.d/00-fwd.conf
*.* @169.254.0.1:514
```
`49-cloud.conf` file should add on each systemvm. This file describes the
logs that eventually sent to a management server
```Java
# cat /etc/rsyslog.d/49-cloud.conf
$InputFileName /var/log/cloud.log
$InputFileTag cloud
$InputFileStateFile stat-file1-cloud
$InputFileSeverity info
$InputFileFacility local7
$InputFilePollInterval 1
$InputFilePersistStateInterval 1
$InputRunFileMonitor
```
Need to uncomment below lines if they are commented in /etc/rsyslog.conf
```python
$ModLoad imudp
$UDPServerRun 3914
```
##### EXPECTED RESULTS
~~~
Management server store systemvm's logs in /var/log/rsyslog/<Systemvm's host
name>/syslog
~~~
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