Log files always contain messages from all the loglevels, including debug, but the minimal loglevel on the terminals can be controlled with the `loglevel` link:https://anaconda-installer.readthedocs.io/en/latest/boot-options.html#inst-loglevel[command line option].
There are two other log files created on the target filesystem, in the `/root` directory, also accessible at `/mnt/sysimage/root` during the installation:
For the logs running in terminals, the format simply is:
----
LOGLEVEL facility:message
----
== Remote logging via TCP
Anaconda supports remote logging handled through the rsyslog daemon running on the installed system.
It can be configured to forward its logs through TCP to an arbitrary machine in network that is also running a syslog daemon.
This is controlled with the `syslog` link:https://anaconda-installer.readthedocs.io/en/latest/boot-options.html#inst-syslog[command line option].
[WARNING]
=====
Do not forget to enable the port you are running your local syslog daemon on in your firewall.
=====
=== What is logged remotely
Everything that is logged directly by anaconda should also appear in the remote logs.
This includes messages emitted by the loader and the storage subsystem.
All anaconda tracebacks (/tmp/anaconda-tb-xyz) are concatenated into a single file /tmp/anaconda-tb-all.log and then transferred.
Also, /tmp/x.log is transferred.
The remote logging only works when the installer initializes network.
Once network is up, it takes a couple of minutes for rsyslogd to realize this.
Rsyslog has a queue for messages that couldn't be forwarded because of inaccessible network and it eventually forwards all of them, in the correct order.
=== Configuration
It's up to you how the remote logging daemon is configured, you can for instance log all incoming messages into one file or sort them into directories according to the IP address of the remote system.
The anaconda RPM provides the `analog` script, which generates a suitable rsyslogd configuration file based on a couple of install parameters.
It is also able to generate a bash command to launch rsyslogd with the generated configuration.
This starts an rsyslog daemon that will listen on port 6080.
The logs from the remote machine with IP 10.34.33.221 will be stored under `/home/akozumpl/remote_inst/10.34.33.221/`, e.g. `/home/akozumpl/remote_inst/10.34.33.221/anaconda.log`.
The remote syslog configuration exploits several log message characteristics to be able to sort them into the correct files:
* the IP of the message sender to know which machine generated the message and thud what directory does the message belong to.
* `anaconda.log, storage.log` and `program.log` have the name embedded in them as `programname`.
* `syslog` messages are coming in from kernel and daemon facilities, just like they do on the installed system
* `install.log.syslog` made during package installation is logged as a special `sysimage` hostname.
Run `analog` without the `-o` option to see how exactly does a fitting configuration file look like.
Also notice that it uses the same message format for remote logging as anaconda does, but you can of course modify this to specify any format you want.
QEMU/KVM in Fedora 13 and onwards allows one to create virtual machines with link:https://fedoraproject.org/wiki/Features/VirtioSerial[multiple virtio char devices] exposed to the guest machine.
One such device can be used to forward anaconda logs to the host machine.
In that way we can get logs forwarded in real time, as soon the anaconda logging subsystem is initialized (early) and not need to wait for the network to come up.
Also, it's the only way to forward the logs in a no-network setup.
Immediately after the Anaconda greeting is displayed the log messages will appear in the directory given to `analog` script, in the `127.0.0.1` subdirectory.
* chroot syslog messages from `/mnt/sysimage/root/install.log.syslog` are not forwarded.
* it is not possible to start the machine unless something is listening on the TCP port where virtio-serial is connected.
* if you want to test that the virtio connection is working, instead of using analog and rsyslog just let a netcat utility listen on the given port, e.g.
* if both remote TCP logging via `syslog=` and remote virtio logging via `virtiolog=` are specified on the command line, one has to setup two rsyslogd instances on the server/host to listen to both the connections otherwise the sending rsyslog's queues get full and the forwarding stops.
If you are asked to provide logs for a bugzilla, your best option is switching from the anaconda GUI to tty2 and then use scp to copy the files to your computer, e.g.:
It is also possible to make a complete dump of a state of running anaconda process (the same dump that is compiled automatically if an unhandled exception occurs).
To do this send the main anaconda process SIGUSR2:
This builds a file `/tmp/anaconda-tb-?????` that also contains `anaconda.log`, `storage.log` and `syslog`.
If you are on a KVM virtual machine and there's no scp available (stage1), you can (after setting up the network if not up already) redirect to a special tcp file, on host:
