My Linode is unreachable after maintenance
This is a basic troubleshooting guide for helping our customers that have issues with accessing their Linode after Maintenance is applied.
Is the Linode powered on?
To see if your Linode is running, you can take a look at your Linode Manager’s dashboard and look for “Running” under the “Status” section. If the status is “Powered Off”, just click on the your Linode’s name in blue, then click the grey
In some cases, the Linode will boot, but there is no SSH access. Our Lish console should be available even when SSH is not. Lish can be used to run any troubleshooting commands that might offer some insight into what the issue is.
You can access your Lish console from the “Remote Access” tab on your Linode’s dashboard. To access Lish through your browser, click “Launch Lish Console”. You will then be able to input your login credentials. As a note, Lish is out of band, so you can use your root login credentials if needed.
Our Network helper ensures that your network interfaces are brought up correctly after a reboot by automatically statically assigning your IPv4 address. In your Linode’s configuration profile, turn on
Auto-Configure Networking, then click
Save. Once that is complete, you can reboot the Linode.
There are a number of commands that we can run to determine if a Linode’s networking interfaces are brought up properly after a reboot.
cat /etc/network/interfaces systemctl status networking.service ip a ip r
cat /etc/sysconfig/network-scripts/ifcfg-eth0 systemctl status -l network.service ip a ip r
[FAILED] Failed to start Raise network interfaces.
If you see the following error message there are specific commands that you can run to see what might have caused the error.
[FAILED] Failed to start Raise network interfaces.
See 'systemctl status networking.service' for details.
sudo systemctl status networking.service -l sudo journalctl -u networking --no-pager | tail -20
If you run those commands and see an output similar to the following, there could be a specific firewall issue that is occurring.
Apr 06 01:03:17 xlauncher ifup: run-parts: failed to exec /etc/network/if-
Apr 06 01:03:17 xlauncher ifup: run-parts: /etc/network/if-up.d/iptables e
You can run the following commands to resolve this issue.
sudo mv /etc/network/if-up.d/iptables ~ ifdown -a && ifup -a
Please note that your firewall will be down at this point, so you will need to re-enable it manually.
Do you have SendMail installed?
If you have SendMail installed and see the following error message, you might be experiencing an issue with a broken SendMail update
[FAILED] Failed to start Raise network interfaces.^M
See 'systemctl status networking.service' for details.^M
Running the following commands from your Linode, while connected via Lish, will give us some more information about the problem:
systemctl status networking.service -l sudo ifdown -a && sudo ifup -a
If you run those commands and see output similar to the following, it is likely that the broken update is at fault.
/etc/network/if-up.d/sendmail: 44: .: Can't open /usr/share/sendmail/dynamic
run-parts: /etc/network/if-up.d/sendmail exited with return code 2
The sendmail issue can usually be resolved by running the following two commands:
sudo mv /etc/network/if-up.d/sendmail ~ ifdown -a && ifup -a
You can read more about the SendMail bug at the following link.
Did all of your services start after the reboot?
Another troubleshooting step that is useful involves determining what services are currently running on your Linode. The following commands will show you what services are running.
sudo netstat -plntu systemctl list-units --type=service service --status-all
If you find that your web server is not running, you will want to restart the service. In most cases, your Linode will be running either Apache or Nginx.
Debian and Ubuntu:
sudo service apache2 restart
Fedora and CentOS:
sudo service httpd restart
sudo service nginx restart
You might also find that your MySQL service is not running. The following command will help you with restarting that.
sudo service mysqld restart
SSH service did not start
If your SSH service did not start, you can run this command to bring it back up.
sudo service ssh restart
sudo systemctl restart sshd.service
If everything seems to be running as expected but you are still unable to connect, you might be running into issues with your firewall. Running the following command will show your your iptables ruleset
If you are unable to determine if a specific rule is causing issues, you can flush your rules and start over. The first command creates a temporary backup of your iptables rules that you can restore if flushing does not resolve the issue.
sudo iptables-save > /tmp/iptables.txt sudo iptables -P INPUT ACCEPT sudo iptables -P FORWARD ACCEPT sudo iptables -P OUTPUT ACCEPT sudo iptables -t nat -F sudo iptables -t mangle -F sudo iptables -F sudo iptables -X
Was your interface renamed?
If your interfaces have been renamed to
ensp0*or something other than
eth0, this is likely due to the latest version of systemd (226-1+), which uses "Predictable Network Interface Names".
You can disable the use of Predictable Network Interface Names with the following command:
ln -s /dev/null /etc/udev/rules.d/80-net-setup-link.rules
After running the command, please reboot your Linode.
For additional details about Predictable Network Interface Names, you can refer to this link.
If the above
ln command does not work, according to the freedesktop.org wiki link above, the way to disable the predictable network interface names is to use the following (you need to reboot):
ln -s /dev/null /etc/systemd/network/99-default.link
If you're not able to ping your Linode's IP, see if you notice the following error message in your boot log or when running the commands "service network restart" or "ifup eth0":
Bringing up interface eth0: Device eth0 does not seem to be present, delaying initialization.
This can generally be fixed by running the following command and rebooting your Linode:
rm -f /etc/udev/rules.d/70-persistent-net.rules
On older Linodes, Network Helper (auto-configure networking) can have a hard time identifying the distribution. You'll know this happened by seeing the following in your Linode's job history:
Network Helper did not run: could not reliably determine distribution or distribution version
If this happens, you should still be able to get your networking back up with static networking.
In cases of some older versions of Debian, you may find that Network Helper isn't helping. You should review the log from the latest boot job, by running:
sudo less /var/log/boot.log
If you see one of the following outputs, you're in luck, because we may have a fix for you, as it's most likely related to this Debian bug:
3: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
link/ether f2:3c:91:df:3a:34 brd ff:ff:ff:ff:ff:ff
From this message, you can see that your eth0 is DOWN. Chances are, the following command might get you back up and running:
ip addr flush dev eth0 ifup eth0
If not, you'll need to configure your Linode's network statically by editing
As a third and final option, you can run the following commands, as this works on most distros:
sudo ip addr flush dev eth0 ip link set eth0 up ip addr add 198.51.100.5/24 broadcast 198.51.100.255 dev eth0 ip route add default via 198.51.100.1
I also had a similar issue where I was not able to connect with my Linode server using SSH.
WHat fixed the issue was:
First uninstall the SSH (https://askubuntu.com/questions/656713/uninstalling-ssh)
Then Install the SSH
And yo, I was again able to connect with SSH.
In addition to mwildman's response, we have a separate Community Questions post that explains network interface renaming: https://www.linode.com/community/questions/18973/lost-networking-after-reboot-network-interface-renamed
There are a few more solutions within that thread that you may find helpful.
In addition to the SendMail issue discussed in this article, there is another SendMail issue. To test for this issue, run this command in your Lish console:
`sudo ifup eth0`
if the result is like this:
/etc/network/if-up.d/sendmail: 44: .: Can't open /usr/share/sendmail/dynamic run-parts: /etc/network/if-up.d/sendmail exited with return code 2 Failed to bring up eth0.
then your problem is probably a vestige of an old sendmail installation which was not fully removed. Assuming you no longer use sendmail, run the two commands at the bottom of this blog post. My Ubuntu 16.04 site was back online instantly, ending this nightmare.