add a new location for Russia

[TOWUK]

server based on 4c75f4b commit (Jun 19)

[TOWUK]

I use systemD to run node smoothly, maybe someone knows how to improve it or is it good too?
[Unit]
Description=CLAJ Server
After=network.target
[Service]
Type=simple
User=root
Group=root
WorkingDirectory=/root/claj
ExecStart=/usr/bin/java -Xms256M -Xmx256M -jar claj-server.jar 1111
Restart=always
RestartSec=5
[Install]
WantedBy=multi-user.target

[ZetaMap]

mm why not but the name is a little bit too long, "MindCup Russia" is better no?
also why not using a service but a good practice is to avoid a much as possible to run a program as root. you can try to create a user just for that and place the server in a more appropriate folder, instead of the root homedir. or you can use docker if you want.
anyway @lapin-b what do you think about his service file, as you done the same thing?

[TOWUK]

yes, I know, the practice for the user is their own service, but there is nothing on this machine, and unfortunately I did not study linux well, logging into the same ssh with a key, as indicated by the hoster (from whom I rented a VDS)

[TOWUK]

let's do this, you tell me how to do it in linux os - I'll do it and run it, fortunately there are enough resources

[ZetaMap]

XD you absolutely want to put contry+region. For moment the region is useless, you just need to name your server Node name+country.

[ZetaMap]

And for your service you can create a new user by doing "adduser claj", and then change the root user into your service, by claj. also you can move the server to the opt folder by doing "mkdit /opt/claj; mv /root/claj-server.jar /opt/claj", and then change the working directory to that one. And to finish, set the permissions by doing "chow claj:claj -R /opt/claj".

This should work.

[TOWUK]

systemctl status claj.service

● claj.service - CLAJ Server
Loaded: loaded (/etc/systemd/system/claj.service; enabled; preset: enabled)
Active: active (running) since Thu 2026-06-25 12:51:49 UTC; 6s ago
Invocation: eb7d4a8353dd4746b1edb635f7423859
Main PID: 71821 (java)
Tasks: 20 (limit: 2315)
Memory: 41.8M (peak: 42.3M)
CPU: 484ms
CGroup: /system.slice/claj.service
└─71821 /usr/bin/java -Xms256M -Xmx256M -jar claj-server.jar 1111

Jun 25 12:51:49 joni systemd[1]: Started claj.service - CLAJ Server.
Jun 25 12:51:49 joni java[71821]: [25-06-2026 12:51:49] [I] Server loaded and hosted on port 1111. Type 'help' for help.

GNU nano 8.4 /etc/systemd/system/claj.service

[Unit]
Description=CLAJ Server
After=network.target
[Service]
Type=simple
User=claj
Group=claj
WorkingDirectory=/home/claj
ExecStart=/usr/bin/java -Xms256M -Xmx256M -jar claj-server.jar 1111
Restart=always
RestartSec=5
[Install]
WantedBy=multi-user.target

[TOWUK]

it is usually customary to specify the region in Russia, because it happens that in the east (Kamchatka/border with China) the US ping is less than in Russia itself on the border of Finland (west / St. Petersburg)

[TOWUK]

is it possible to run it somehow but with access to the console? but not through tmux/screen solutions?

[ZetaMap]

@lapin-b can you help about that? you done the same thing.

[lapin-b]

is it possible to run it somehow but with access to the console? but not through tmux/screen solutions?

@TOWUK Yes you can. According to systemd's docs, you create a .socket file with the same name of the server (that would be claj.socket for you) that creates a named pipe, then you wire the standard input into that pipe. My setup is as follows.

The "socket" file:

# New file at /etc/systemd/system/claj.socket
[Unit]
Description = Socket to communicate with claj.service

[Socket]
ListenFIFO=/run/claj.fifo
# The FIFO (named pipe) is not removed when the socket exits
ExecStopPost = /bin/rm -f /run/claj.fifo
SocketUser=claj
SocketGroup=root

Then you add the following contents after the [Service] section of your claj.service.

StandardInput=socket
StandardOutput=journal
StandardError=journal

To interact with the server standard input, you write things into /run/claj.fifo and then you read the journal that should contain the output. The command I use for that is the following:

# Write stuff into the named pipe, wait for a little bit, get the output from the journal
echo rooms > /run/claj.fifo ; sleep 0.1 ; journalctl --no-pager -eu claj

[ZetaMap]

commits squashed, i accept.
please also note that your node must have a good uptime, by that i mean if your node is always down or it is for too long, i will remove it (after some warnings indeed).
and also don't forget to check sometimes for updates, as the server doesn't have an auto-updater, you will have to download the latest version each time a new release comes.

[TOWUK]

commits squashed, i accept. please also note that your node must have a good uptime, by that i mean if your node is always down or it is for too long, i will remove it (after some warnings indeed). and also don't forget to check sometimes for updates, as the server doesn't have an auto-updater, you will have to download the latest version each time a new release comes.

okay, thanks, I'll try to maintain stability and availability, as well as update the claj server build approximately every 2 weeks (locally build on a PC from the current repository and upload to the server)

[TOWUK]

I also studied the issue of interaction with AI, and he told me how to do it using the above method with a socket:

/etc/systemd/system/claj.socket :

[Socket]
ListenFIFO=/run/claj.fifo
SocketUser=claj
SocketGroup=claj
SocketMode=0660
RemoveOnStop=true

/etc/systemd/system/claj.service :

[Unit]
Description=CLaJ Server
Requires=claj.socket
After=network.target

[Service]
User=claj
Group=claj

WorkingDirectory=/home/claj
ExecStart=/usr/bin/java -Xms256M -Xmx256M -jar claj-server.jar 1111

StandardInput=socket
StandardOutput=journal
StandardError=journal

Restart=always
RestartSec=5
StartLimitIntervalSec=60
StartLimitBurst=5

[Install]
WantedBy=multi-user.target

/usr/local/bin/claj :

#!/usr/bin/env bash
set -euo pipefail

FIFO="/run/claj.fifo"
SERVICE="claj.service"

if ! systemctl is-active --quiet "$SERVICE"; then
    echo "ERROR: $SERVICE NOT RUNNING!" >&2
    exit 1
fi

if [ ! -p "$FIFO" ]; then
    echo "ERROR: $FIFO DOES NOT EXIST" >&2
    exit 1
fi

if [ "$EUID" -ne 0 ]; then
    echo "$@" | sudo tee "$FIFO" > /dev/null
else
    echo "$@" > "$FIFO"
fi

sleep 1

if [ "$EUID" -ne 0 ]; then
    sudo journalctl -q -u "$SERVICE" --since "5 seconds ago" --no-pager
else
    journalctl -q -u "$SERVICE" --since "5 seconds ago" --no-pager
fi

chmod +x /usr/local/bin/claj + crontab -e

TZ=Europe/Moscow

58 2 * * * timeout 5 sh -c '[ -p /run/claj.fifo ] && echo "say all Global restart after 2 minutes (3:00 MSK)" > /run/claj.fifo
0 3 * * * systemctl restart claj.service