Pay attention to your Steemd API Node's file descriptor settingssteemCreated with Sketch.

in #witness7 days ago (edited)

Hi, every witness and developer !

If you are running a MIRA version Steemd API Node, pay attention to your Linux file descriptor settings.

Currently the MIRA version Steemd API Node's blockchain folder has 33516 files.

# ls -lR blockchain/ | grep "^-" | wc -l
33516

If your system has not enough file descriptor, that will cause the steemd node can not write data to disk.

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Then the node will break down.

You can run these commands to check your file descriptor setting:

# ulimit -Hn
# ulimit -Sn

If you are using Docker as your runtime environment, please execute these commands in the container.

To increase your system file descriptor, edit these two settings in your /etc/security/limits.conf config:

* soft nofile 1024000
* hard nofile 1024000

Then restart your system and check if it works.

If you are using Docker as the runtime environment, you can add --ulimit nofile=1024000:1024000 as the param of docker run.
Example: docker run -itd --name api --ulimit nofile=1024000:1024000 <the_docker_image>.

Also you could edit /etc/sysconfig/dockerand change this line OPTIONS=" — default-ulimit nofile=1024:4096". After saved, restart docker daemon. Then all the docker containers will increase the nofile. ( This method is tested on AWS Linux 2 OS. )

About tuning the RocksDB, it has been put in plan. I will study if it is possible to decrease the number of db files.


Thank you for reading. I'm a witness. You could find more on my site https://steem.fans

I would really appreciate your witness vote! You can vote by AuthSteem. Or open https://steemitwallet.com/~witnesses page, input ety001 to vote.

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Thank you!

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