Unraid / Docker Newbie here. 

 

My unRaid server connects to the internet just fine.  Unraid Connect is installed and works just fine.  I'm able to download and install plugins.  

However, I cannot install apps/containers into Docker. I keep getting "no such host" errors and the install(s) fails. 

 

(Error message and sys logs appended below and diagnostics attached)

 

Any ideas or suggestions?

Thanks!

 

12/23 Update:

Apparently this a DNS settings issue and adding two external public DNS servers in Network Settings fixed the problem. 🙂 

Per Unraid support:

In Unraid Network Settings

(1) Enable Static DNS addresses
(2) Add as #1 DNS: 208.67.222.222
(3) Add as #2 DNS: 208.67.220.220

 

12/21 Update:

I don't know if enabling IP6 is a solution, workaround, or it coincidentally resets something, but I enabled IP6 on my router, then selected "IP4 & IP6" in my Unraid network settings.  As of now, it did the trick and Docker can now pull down what it needs from the internet.  🙂 

 

---------------------------------------
 

12/19 Update:

I did a clean re-install of unraid on my computer to ensure all the defaults were set correctly.   All internet connections outside of docker work normally.  But when I go to install a docker container, the error I'm getting is "no such host".     See the full sample error message below.

docker run
  -d
  --name='Home-Assistant-Container'
  --net='bridge'
  --privileged=true
  -e TZ="America/Los_Angeles"
  -e HOST_OS="Unraid"
  -e HOST_HOSTNAME="SVR1"
  -e HOST_CONTAINERNAME="Home-Assistant-Container"
  -l net.unraid.docker.managed=dockerman
  -l net.unraid.docker.webui='http://[IP]:[PORT:8123]'
  -l net.unraid.docker.icon='https://raw.githubusercontent.com/balloob/unraid-docker-templates/master/balloob/home-assistant-icon.png'
  -v '/mnt/user/appdata/Home-Assistant-Container':'/config':'rw' 'ghcr.io/home-assistant/home-assistant:stable'

Unable to find image 'ghcr.io/home-assistant/home-assistant:stable' locally
docker: Error response from daemon: Head "https://ghcr.io/v2/home-assistant/home-assistant/manifests/stable": Get "https://ghcr.io/token?scope=repository%3Ahome-assistant%2Fhome-assistant%3Apull&service=ghcr.io": dial tcp: lookup ghcr.io on 192.168.200.1:53: no such host.
See 'docker run --help'.

The command failed.

____________________

 

 

svr1-diagnostics-20231219-2222.zip

Edited December 23, 20232 yr by CCWeb
Added Unraid's suggested solution

On mobile now so can't look at Diagnostics yet. 

 

 

A couple of weeks ago, my UNRAID installation started giving me trouble.  The first symptom was that connections to the UNRAID server using Wireguard just stopped working.  Of note, I have recently changed my router to a Google Nest Wifi Pro 6E, however everything worked fine for a few weeks after I switched routers.  I also recently performed an update to 6.12.6 from something in the 6.11.8 range.  I do not remember if everything ever worked correctly once I got on 6.12.6.  I never could get Wireguard working, so I clicked on APPS to look for an alternative to Wireguard for VPN access.  That is when I saw the "Download of appfeed failed" message shown below.

 

I have enabled DHCP as well as set my DNS servers to 8.8.8.8, 8.8.4.4, and my router's IP address in UNRAID.  I have also noticed that Docker is not displaying the version/whether each container is up-to-date. 

 

I have one VM running, and it does have internet connectivity, for what it's worth.

 

Any help would be appreciated.

 

 

unraid-diagnostics-20240122-2007.zip

Edited January 24, 20242 yr by d_freshmaker

Those diagnostics appear to be a couple of days old. Are you sure your server has the correct date and time?

Yes, my date and time are correct (just re-verified).  Those diagnostics are from a couple of days ago when I created a thread asking for help.  You posted a link to this thread, which I thought was you implying I should post here, and I re-used the same export.

1 hour ago, d_freshmaker said:

You posted a link to this thread, which I thought was you implying I should post here

I intended for you to read the linked post

I reverted back to 6.11.5, then updated to 6.12.8, and everything magically started working again.

Greetings, Im also kind of a newbie to unraid.  Im at a loss, i rebuild the server(new mobo and cpu) i figured it would be fine. nope its flakky as hell

plex disappeared(uninstalled itself) and i can go to the apps and download anything give me a dns error, which i never had before...

any help would be greatly appreciated

diag included

venus-diagnostics-20240622-2221.zip

Edited June 23, 20242 yr by dark270

6 hours ago, dark270 said:

download anything give me a dns error

Remove the gateway from eth1, only eth0 should have a gateway.

2 hours ago, JorgeB said:

Remove the gateway from eth1, only eth0 should have a gateway.

ok, even tho i have a onboard NIC disabled unraid still 'sees' it

so if i just delete the network.cfg  could that fix my issues?

10 hours ago, dark270 said:

so if i just delete the network.cfg  could that fix my issues?

You can do that, or just edit the file and remove all entries for eth1

13 hours ago, JorgeB said:

You can do that, or just edit the file and remove all entries for eth1

thank u! it worked!  solved both issues and saved me from starting over.....

On 12/17/2023 at 10:52 PM, CCWeb said:

Unraid / Docker Newbie here. 

 

My unRaid server connects to the internet just fine.  Unraid Connect is installed and works just fine.  I'm able to download and install plugins.  

However, I cannot install apps/containers into Docker. I keep getting "no such host" errors and the install(s) fails. 

 

(Error message and sys logs appended below and diagnostics attached)

 

Any ideas or suggestions?

Thanks!

 

12/23 Update:

Apparently this a DNS settings issue and adding two external public DNS servers in Network Settings fixed the problem. 🙂 

Per Unraid support:

In Unraid Network Settings

(1) Enable Static DNS addresses
(2) Add as #1 DNS: 208.67.222.222
(3) Add as #2 DNS: 208.67.220.220

 

12/21 Update:

I don't know if enabling IP6 is a solution, workaround, or it coincidentally resets something, but I enabled IP6 on my router, then selected "IP4 & IP6" in my Unraid network settings.  As of now, it did the trick and Docker can now pull down what it needs from the internet.  🙂 

 

---------------------------------------
 

12/19 Update:

I did a clean re-install of unraid on my computer to ensure all the defaults were set correctly.   All internet connections outside of docker work normally.  But when I go to install a docker container, the error I'm getting is "no such host".     See the full sample error message below.

docker run
  -d
  --name='Home-Assistant-Container'
  --net='bridge'
  --privileged=true
  -e TZ="America/Los_Angeles"
  -e HOST_OS="Unraid"
  -e HOST_HOSTNAME="SVR1"
  -e HOST_CONTAINERNAME="Home-Assistant-Container"
  -l net.unraid.docker.managed=dockerman
  -l net.unraid.docker.webui='http://[IP]:[PORT:8123]'
  -l net.unraid.docker.icon='https://raw.githubusercontent.com/balloob/unraid-docker-templates/master/balloob/home-assistant-icon.png'
  -v '/mnt/user/appdata/Home-Assistant-Container':'/config':'rw' 'ghcr.io/home-assistant/home-assistant:stable'

Unable to find image 'ghcr.io/home-assistant/home-assistant:stable' locally
docker: Error response from daemon: Head "https://ghcr.io/v2/home-assistant/home-assistant/manifests/stable": Get "https://ghcr.io/token?scope=repository%3Ahome-assistant%2Fhome-assistant%3Apull&service=ghcr.io": dial tcp: lookup ghcr.io on 192.168.200.1:53: no such host.
See 'docker run --help'.

The command failed.

____________________

 

 

svr1-diagnostics-20231219-2222.zip 119.05 kB · 2 downloads

I'm also experiencing this problem. Did you find a solution? 

Hi folks. Joining in on this issue. On friday night, i was downloading some files on my VM which was stored on my CACHE drive, it quickly filled up my drive. I ended up moving the VM disks over to my array and since then i havent been able to access the internet via Unraid (plugins, apps, OS Upgrade, etc) however no issues via Docker containers, they connect successfully. I used chatgpt/deepseek and reset the network config files, i also downgraded the OS from 7.1.3 to 7.1.2 hoping it would reset something but no go.

Not sure if someone can help review the logs and provide some insight as to what may be going on. Thank you.

server-diagnostics-20250720-2151.zip

Server is unable to access the internet. Try changing your DNS server to 208.67.222.222 and 208.67.220.220 instead of using your router. Settings - Network Settings

@JorgeB tried that, same issue. Here are the updated logs. Thank you!

server-diagnostics-20250721-0840.zip

Still unable to access the internet, this looks like an external problem. To confirm you can boot with a different flash drive using a stock Unraid install, no key needed, then see if you can install apps.

5 hours ago, JorgeB said:

Still unable to access the internet, this looks like an external problem. To confirm you can boot with a different flash drive using a stock Unraid install, no key needed, then see if you can install apps.

---

UPDATE - Forgot to mention, so it can communicate using the direct IP. If i ping say 8.8.8.8, it does respond. When i ping using the domain, it fails. I did fix my DNS settings as mentioned before. Still lost.

Havent tried that yet. The issue all started when the cache drive filled up. Cache drive has since had the VM disk moved to the ARRAY to prevent it from happening again. I am able to access the internet using the docker containers, its just Unraid that cant connect to the internet.

I'll get another flash drive, install a stock unraid and attempt this and will circle back. Thanks.

Edited July 21, 2025Jul 21 by miamidev

3 hours ago, miamidev said:

Havent tried that yet. The issue all started when the cache drive filled up. Cache drive has since had the VM disk moved to the ARRAY to prevent it from happening again. I am able to access the internet using the docker containers, its just Unraid that cant connect to the internet.

I'll get another flash drive, install a stock unraid and attempt this and will circle back. Thanks.

You can disregard my issue, i inadvertently deleted my flash drive and lost my whole config. luckily the docker appdata were on the array so im going one by one readding everything back in. sucks but it is what it is. thanks for the help though.

Hi guys, started having this problem recently after changing home and getting a new ISP and Router.

All my apps that are from ghcr.io or lscr.io repos are unable to download or update. All others work fine. Can someone point me to the right direction? I'm on unRAID 7.1.4.

1 hour ago, madb1ker said:

Hi guys, started having this problem recently after changing home and getting a new ISP and Router.

All my apps that are from ghcr.io or lscr.io repos are unable to download or update. All others work fine. Can someone point me to the right direction? I'm on unRAID 7.1.4.

Try setting static DNS addresses in your server (Settings - Network settings). Use 208.67.222.222 and 208.67.220.220 and see if that makes a difference

18 hours ago, Squid said:

Try setting static DNS addresses in your server (Settings - Network settings). Use 208.67.222.222 and 208.67.220.220 and see if that makes a difference

That did the trick, its working now. Although I never had to set Static DNS before so i still dont really understand what happened.

Thank you! :)

There's no telling what dns an ISP points a customer at; most likely the one that pays them the most. You probably landed on a lesser one with your new isp. OpenDNS is a good one (arguably the best) which is what Squid pointed you towards.