Minecraft server package seems to be unstable?
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Hello,
I just installed the Minecraft server package and after 2 minutes the server complained about being laggy/not processing events quick enough. Afterwards I destroyed a few blocks and I got disconnected because connection was resetted/lost. Rejoining doesn't work (error "Connection refused: no further information"). Server log just shows this:
Aug 05 14:07:24 [12:07:24] [Server thread/INFO]: <username> joined the game Aug 05 14:07:24 [12:07:24] [Server thread/INFO]: <username>[/<ip>:<port>] logged in with entity id <id> at (-19.5, 66.0, 57.5) Aug 05 14:07:24 [12:07:24] [User Authenticator #1/INFO]: UUID of player <username> is <uuid removed> Aug 05 14:09:40 [12:09:40] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 3086ms or 61 ticks behindWhat could be the root cause? I didn't change the memory settings or anything else. It's not a Forge server (Minecraft Server package v1.8.1).
Best Regards,
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Could it be that setting the memory limit is broken? I'm asking because of this:
Aug 05 14:22:14 Failed to determine memory limit. Falling back to 1024M Aug 05 14:22:14 Server is up and running on port <port> Aug 05 14:22:14 Use ldap auth Aug 05 14:22:14 start minecraft server with memory limit 1024 M -
I can reproduce this, appears related to cgroup v2.
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W warg marked this topic as a question on
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W warg has marked this topic as solved on
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The fix is sadly not completely working. It does read the value without an error now but the value is wrong. I did set 4 GB of RAM for Forge and it did output this in the console:
Aug 09 21:05:18 Starting Forge Server with memory limit 3277MSo it looks like the wrong unit is used.
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W warg has marked this topic as unsolved on
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Can you open a webterminal and read the vile
/sys/fs/cgroup/memory/memory.limit_in_bytesto see how much the container actually got allocated in the end?On Linux with docker containers have memory limits set with parts swap and physical memory (half half). So the memory limit calculation for Cloudron also takes this into account to prevent user error, without having to educate about the technical details much. Anyway those limits are upper limits and not reserved memory per app. Those act as a safety net to prevent a rouge app to bring down the whole server or also guide language runtimes like java/ruby/nodejs/... do not cache too much and run their garbage collectors more often. Essentially make them behave better in environments where they don't have the whole system on their own.
In Cloudron you can see the actual memory limit set in the backend calculated here: https://git.cloudron.io/cloudron/box/-/blob/master/src/system.js#L207
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@nebulon said in Minecraft server package seems to be unstable?:
Can you open a webterminal and read the vile /sys/fs/cgroup/memory/memory.limit_in_bytes to see how much the container actually got allocated in the end?
I don't find the file you have mentioned, neither in the container nor from the shell as root. There's a
/sys/fs/cgroup/directory andmemory.*files in it but nomemory.limit_in_bytes. -
I reworked the minecraft* apps to use a single code base now. The fixes are:
- oidc support
- memory limit computation (cgroup v2)
- duplicate log lines
- better log lines in the ui
- various other ui issues
- log history
Big thanks to @warg for all the bug reports. I have already fixed up the forge app, the other two will follow shortly today.
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G girish has marked this topic as solved on
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Beside of the fixes and the Forge app and Minecraft app doing nothing (no players, new world so nothing automatically running, e. g. redstone stuff, no mods) + having plenty of free RAM, the server is unstable according to its logging:
Aug 10 12:05:57 [10:05:57] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 3277ms or 65 ticks behind Aug 10 12:22:59 [10:22:59] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 6428ms or 128 ticks behind Aug 10 12:36:09 [10:36:09] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 9279ms or 185 ticks behind Aug 10 12:39:44 [10:39:44] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 11625ms or 232 ticks behind Aug 10 20:48:30 [18:48:30] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 6541ms or 130 ticks behind Aug 10 21:51:17 [19:51:17] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 12512ms or 250 ticks behind Aug 10 21:58:43 [19:58:43] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 14030ms or 280 ticks behind Aug 11 00:26:51 [22:26:51] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 8281ms or 165 ticks behind Aug 11 04:43:37 [02:43:36] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 5874ms or 117 ticks behind Aug 11 06:14:26 [04:14:26] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 3928ms or 78 ticks behind Aug 11 06:30:14 [04:30:14] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 5482ms or 109 ticks behind Aug 11 07:20:26 [05:20:26] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 11857ms or 237 ticks behind Aug 11 09:04:06 [07:04:06] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 9322ms or 186 ticks behind Aug 11 09:12:49 [07:12:49] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 25424ms or 508 ticks behind Aug 11 09:22:43 [07:22:43] [Server thread/WARN] [minecraft/MinecraftServer]: Can't keep up! Is the server overloaded? Running 4898ms or 97 ticks behindDoes someone else face this? What else could be the root cause here? I don't think it's related to any resource bottleneck.
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I noticed this as well. I assume this is related to too little memory or low CPU. Have you tried allocating much more RAM? I can test this later as well and maybe also change the default memory allocation.
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RAM is always idling between 1 and 2 GB while 4 is assigned. CPU should be fine too, at least I don't notice any performance issues or bottlenecks within the OS or other apps. The only other thing that is slow at the moment is Nextcloud 27.0.2 but that could be due to the latest update? Not sure. I will assign 8 GB RAM. Let's see.
