Question
My CPU is at 100% and I don't know how to resolve this.
- Posted on February 5, 2020
- Ubuntu 18.04
Asked by warrenlee
Hi all, I have a droplet used for hosting multiple web site and recently my CPU has reached 100% constantly these past few days and I have not touched the server for a while.
Installed are nginx, php, mysql, cron and docker.
I have used the top command and found there’s a process using a command called mh
| PID | USER | PR | NI | VIRT | RES | SHR | S | %CPU | %MEM | TIME+ | COMMAND |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 5208 | 82 | 20 | 0 | 855300 | 884 | 56 | S | 99.3 | 0.1 | 6:43.80 | mh |
I have tried rebooting the server, restarting cron, restarting docker, killing the process but it keeps coming back.
Has anyone got any idea whats happening or how to prevent this?
Appreciated
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For cpu at 100% most of the times is caused by ddos attacks. A good starting point would be to check your apache or nginx logs if using apache or nginx. The install fail2ban and start banning ip addresses which are generating weird get or post requests.
First clear all your current logs and then start watching the logs to see whats generating fast logs and you can initially ban then using ufw then later use the log to generate a fail2ban regex which should block such cases in the future.
Hello,
I think that the
mhcommand is this MisterHouse Perl script here:https://github.com/hollie/misterhouse
What I could suggest is running
psand checking out the full command:That way you would be able to see the full command that is running rather than just the
mhoutput.Then you could go from there and decide if this is something that you need or not.
If you don’t need this service, you could remove it from your system.
Feel free to share the output of the
pscommand here.Regards, Bobby
Hi,
I can’t learn much from your description,but there is a sample for you that once happened on me.Your server may be attacked,like DoS or CC.I think you’d better protect your server by using floating ip and try CloudFlare to avoid being that.And,change the password and the login port.Dont use 22 as the port.
Have a nice day.
Shiroka