Logs
The default location of logs is /var/log/memgraph/memgraph.log
but it can be
changed using the --log-file
configuration flag.
Memgraph tracks logs at various levels: TRACE, DEBUG, INFO, WARNING, ERROR,
CRITICAL. By default, it is using the WARNING level, but you can change the
level using the --log-level
configuration file or during
runtime using the SET DATABASE SETTING "log.level" TO "WARNING";
The configuration set during runtime will be applied only for that session.
You can check the log level by running SHOW DATABASE SETTING "log.level";
query.
If you are using Memgraph Lab, you can access the Logs from the interface if the port 7444 was exposed when running the instance.
Access logs
If you installed Memgraph with Linux, logs can be found in the
/var/log/memgraph
directory.
If you installed Memgraph using Docker:
Find container ID
Open a new terminal and find the CONTAINER ID
of the Memgraph Docker
container:
docker ps
Enter the container
Run the following command:
docker exec -it <CONTAINER ID> bash
Be sure to replace the <CONTAINER ID>
parameter.
List the /var/log/memgraph
directory
Position yourself in the /var/log/memgraph
directory.
ls /var/log/memgraph
List the content of the log
To list the content of the log, use the cat /var/log/memgraph/<memgraph_date>.log
command.
For example, if the ls
command returned memgraph_2022-03-04.log
you would
list the contents using the following command:
cat /var/log/memgraph/memgraph_2022-03-04.log
Filtering unnecessary log messages
When you inspect Memgraph's log files, you might find too many details that make it
hard to spot the important messages. To make analyzing the logs easier, you can
use a tool such as grep
to remove the messages you don't need. For instance,
if you want to ignore messages about internal Memgraph Lab work or too much information on storage, indexes, rules, and triggers, you can use this grep command:
grep -v -E "SHOW STORAGE INFO|APP_INTERNAL_EXEC_VAR|SHOW INDEX INFO|SHOW CONSTRAINT INFO|SHOW TRIGGERS" /var/log/memgraph/memgraph_2022-03-04.log
This command excludes log lines containing SHOW STORAGE INFO
, any occurrences
of APP_INTERNAL_EXEC_VAR
, SHOW INDEX INFO
, SHOW CONSTRAINT INFO
, and SHOW TRIGGERS
, making it easier to focus on the messages that are most relevant to
your monitoring and troubleshooting efforts.
Note: Replace /var/log/memgraph/memgraph_2022-03-04.log
with the actual path to your log
file.
Save logs locally
If you want to save the log to your computer, exit the container with
CTRL+D
or exit
, place yourself in a directory where you want to save the copy and run
the following command:
docker cp <CONTAINER ID>:/var/log/memgraph/<memgraph_date>.log <memgraph_date>.log
For example, the following command will make a copy of the
memgraph_2022-03-04.log
file on the user's desktop:
C:\Users\Vlasta\Desktop>docker cp bb3de2634afe:/var/log/memgraph/memgraph_2022-03-04.log memgraph_2022-03-04.log