Linux – CPU% more than 100 in ps -aux

cpu-usagelinuxps

We use ps -aux to find out when tomcat process takes high CPU utilization, if that so we will send a alert to Group. But some times %CPU shows more than 100, but our application working fine. Is it bad sign or whether our understanding is correct fins CPU usage for a process

This is the output When I execute the command,

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root     16228 106 24.0 2399428 1840576 ?     Sl   07:11 171:35 /usr/bin/java -Djava.util.logging.config.file=/opt/tomcat-rc-core-v1-inst01/conf/logging.properties -Dj

Best Answer

How many cores do you have on this server? 106% means it's occupying a full core plus a little of another. So, if you have say, 4 cores, a process that is multi-threaded (so it can handle pushing load to all cores) could reach 400%. top will confirm this behavior.

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MySQL Configuration – How to Bind MySQL Server to Multiple IP Addresses

No, there isn't (I just checked 1 hour ago). You can comment the bind-address in my.cnf:

Note: « 1 hour ago » is now more than 10 years ago.

#skip-networking
#bind-address                   = 127.0.0.1

If you want only 2 IPs, you will then have to use a firewall.

For MySql version 8.0.13 and above, you can specify a list of comma-separated IP addresses.

bind-address = 10.0.0.1,10.0.1.1,10.0.2.1

Relevant MySql documentation.

Remember to restart your MySQL instance after changing the config file.

Linux – Pain removing a perl rootkit

If I can give you any advice, it is to stop wasting your time cleaning up. Make an image of the OS for forensic stuff for later, and just reinstall the server.

Sorry, but its the only secure way to resolving yourself from being rootkitted.

Later you can check the image, for certain reasons, why it happened.

From my own personal experience, I did this, and later found an internal user which had a SSH key containing the flaw of openssl in 2008.

I hope, it clears up the things.

Note:
If you are going to image/backup the server before reinstalling, be very careful, how you do this. As @dfranke said, boot from a trusted medium to backup.

You shouldn't connect to other machines from a rooted server, as great rootkits are known to be able to spread through trusted sessions such as SSH.

Best Answer

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MySQL Configuration – How to Bind MySQL Server to Multiple IP Addresses

Linux – Pain removing a perl rootkit

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