While going through the MySQL logs from a DO instance, I found the following entries:
2020-06-04T08:14:44.965714Z 2 [Warning] Hostname 'rnd.group-ib.ru' does not resolve to '80.82.70.118'.
2020-06-04T08:14:44.965862Z 2 [Note] Hostname 'rnd.group-ib.ru' has the following IP addresses:
2020-06-04T08:14:44.965873Z 2 [Note] - 5.9.185.30
2020-06-04T14:20:41.322359Z 3 [Warning] Host name 'zg-0428c-606.stretchoid.com' could not be resolved: Name or service not known
I have never seen this before. Could this be a potential security concern?
This textbox defaults to using Markdown to format your answer.
You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!
Accepted Answer
Hi @AGhafoori,
Hmm this does look troubling. Usually, this doesn’t give out IP addresses unless specifically told so. I’ll recommend to check your whole log and see if these IP addresses occur on other lines of the log.
Additionally, you can try and enable a MySQL option which shows what command the IP Address has executed. To accomplish it, just enable the general logs in MySQL. To enable it you can follow different ways.
Put this in my.cnf file of your MySQL:
general-log=1
After that, restart MySQL server and it will start logging everything in the log file.
You can start the MySQL server with this variable at command line --general_log and it will also start creating the log file.
These logs will have all the information regarding who connected to your server and what all commands they used or executed.
Regards, KDSys
Hello @KDSys,
Thanks for the suggestions. I’ll treat the server as compromised and proceed to change my keys, password etc.
Become a contributor for community
Get paid to write technical tutorials and select a tech-focused charity to receive a matching donation.
DigitalOcean Documentation
Full documentation for every DigitalOcean product.
Resources for startups and SMBs
The Wave has everything you need to know about building a business, from raising funding to marketing your product.
The developer cloud
Scale up as you grow — whether you're running one virtual machine or ten thousand.
Get started for free
Sign up and get $200 in credit for your first 60 days with DigitalOcean.*
*This promotional offer applies to new accounts only.