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miguelmorin avatar Server

Unable to connect to Lightsail instances through SSH

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miguelmorin

Yesterday around 21:30 GMT, my server on AWS Lightsail crashed. I cannot connect to it through SSH. I am also unable to connect to a separate small server, which checked the uptime of the first. I can connect through browser SSH, but not with SSH, even after restarting the instances.

Since these are two separate servers with no public connection to each other, I wonder if Lightsail may have some technical issues. But as I am on the Basic plan, support is not included.

How can I investigate the problem?

update

I checked four of the logs in /var/log: auth.log, apport.log, kern.log and syslog on the Lightsail instance running a bitnami image and a NodeJS server.

kern-log showed the culprit. Usually it has very few entries, about 5. Around this date, it has 500 lines, starting with:

Jan 29 21:39:41 ip-172-26-9-252 kernel: [    0.000000] Initializing cgroup subsys cpuset

and ending with:

Jan 29 21:39:41 ip-172-26-9-252 kernel: [   20.435952] audit: type=1400 audit(1643492358.140:11): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/lxd/lxd-bridge-proxy" pid=708 comm="apparmor_parser"

The other Lightsail instance, running a different image on a different region, and not set up as a web server, shows similar entries around that time. The first line is:

Jan 30 07:27:17 ip-172-26-5-35 kernel: [    0.000000] Initializing cgroup subsys cpuset

and the last is:

Jan 30 07:27:17 ip-172-26-5-35 kernel: [    9.476419] cgroup: new mount options do not match the existing superblock, will be ignored

So this seems to have been a Lightsail issue, since it affected two separate instances at about the same time. How can I confirm that?

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Tim avatar
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Tim
I would be surprised if Lightsail was having technical issues going on this long. I would check the firewalls - both inside the instance and the one linked. I'd also check that ssh daemon was running, as the browser based ssh uses a different way to access the instance. https://aws.amazon.com/blogs/compute/enhancing-site-security-with-new-lightsail-firewall-features/
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