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问题[gnu-screen](ubuntu)

Martin Hope
person
Asked: 2020-11-27 14:12:49 +0800 CST
  • 1

我在家庭服务器上运行 ubuntu 20.04 服务器，并且我有一个自托管的 minecraft 实例，位于 /opt/minecraft/server，由用户 minecraft 拥有。我可以手动激活服务器就好了。但是，我想让服务器在启动时不断运行该进程，但我无法让 systemd 脚本正常工作。我将在下面发布，但这里有一些初步的

这是我验证 minecraft:minecraft 拥有一切：

albert@mfs:/opt/minecraft$ ls -l survival
total 37108
-rw-r--r--  1 minecraft minecraft        2 Nov 26 01:04 banned-ips.json
-rw-r--r--  1 minecraft minecraft        2 Nov 26 01:04 banned-players.json
-rw-r--r--  1 minecraft minecraft      180 Nov 25 23:16 eula.txt
drwxr-xr-x  2 minecraft minecraft     4096 Nov 26 01:04 logs
-rw-r--r--  1 minecraft minecraft      136 Nov 26 01:04 ops.json
-rw-r--r--  1 minecraft minecraft 37961464 Nov 25 23:16 server.jar
-rw-r--r--  1 minecraft minecraft     1073 Nov 26 01:04 server.properties
-rw-r--r--  1 minecraft minecraft      323 Nov 26 03:30 usercache.json
-rw-r--r--  1 minecraft minecraft        2 Nov 25 23:16 whitelist.json
drwxr-xr-x 11 minecraft minecraft     4096 Nov 26 04:36 world

启动服务并检查状态后：

albert@mfs:~$ sudo systemctl status minecraft@survival
● [email protected] - Minecraft Server survival
     Loaded: loaded (/etc/systemd/system/[email protected]; enabled; vendor preset: enabled)
     Active: activating (auto-restart) (Result: exit-code) since Thu 2020-11-26 21:13:11 UTC; 5s ago
    Process: 99802 ExecStart=/bin/sh -c /usr/bin/screen -DmS mc-survival /usr/bin/java -server -Xms512M -Xmx2048M -XX:+UseG1GC -XX:+CMSIncrementalPacing -XX:+CMSClassUnloadi>
    Process: 99820 ExecStop=/usr/bin/screen -p 0 -S mc-survival -X eval stuff "say SERVER SHUTTING DOWN. Saving map..."\015 (code=exited, status=1/FAILURE)
   Main PID: 99802 (code=exited, status=0/SUCCESS)

检查 journalctl 后

    albert@mfs:~$ journalctl -u minecraft@survival
    -- Logs begin at Wed 2020-06-03 18:13:36 UTC, end at Thu 2020-11-26 20:59:45 UTC. --
    Nov 25 23:18:34 my.freakin.server systemd[1]: Started Minecraft Server: survival.
    Nov 25 23:18:34 my.freakin.server screen[78218]: No screen session found.
    Nov 25 23:18:34 my.freakin.server systemd[1]: [email protected]: Control process exited, code=exited, status=1/FAILURE
    Nov 25 23:18:34 my.freakin.server systemd[1]: [email protected]: Failed with result 'exit-code'.
    Nov 25 23:18:34 my.freakin.server systemd[1]: [email protected]: Scheduled restart job, restart counter is at 1. 
    
    [and so on, four more times]

我尝试了几个不同的配置文件，并注意到这个问题没有变化（可以确认我一直在重新加载守护进程）。（我应该启用分叉吗？）。这是我当前的 systemd 文件：

albert@mfs:~$ cat /etc/systemd/system/[email protected]    
# source: https://github.com/agowa338/MinecraftSystemdUnit/
# License: MIT
[Unit]
Description=Minecraft Server %i
After=network.target

[Service]
WorkingDirectory=/opt/minecraft/%i
PrivateUsers=true 
# Users Database is not available for within the unit, only root and minecraft is available, everybody else is nobody
User=minecraft
Group=minecraft
ProtectSystem=full 
# Read only mapping of /usr /boot and /etc
ProtectHome=true 
# /home, /root and /run/user seem to be empty from within the unit. It is recommended to enable this setting for all long-running services (in particular network-facing ones).
ProtectKernelTunables=true 
# /proc/sys, /sys, /proc/sysrq-trigger, /proc/latency_stats, /proc/acpi, /proc/timer_stats, /proc/fs and /proc/irq will be read-only within the unit. It is recommended to turn this on for most services.
# Implies MountFlags=slave
ProtectKernelModules=true 
# Block module system calls, also /usr/lib/modules. It is recommended to turn this on for most services that do not need special file systems or extra kernel modules to work
# Implies NoNewPrivileges=yes
ProtectControlGroups=true 
# It is hence recommended to turn this on for most services.
# Implies MountAPIVFS=yes
# ExecStart=/bin/strace -o /tmp/s -f screen -dm -S me bash -c 'sleep 999'
ExecStart=/bin/sh -c '/usr/bin/screen -DmS mc-%i /usr/bin/java -server -Xms512M -Xmx2048M -XX:+UseG1GC -XX:+CMSIncrementalPacing -XX:+CMSClassUnloadingEnabled -XX:ParallelGCThreads=2 -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10 -jar $(ls -v | grep -i "FTBServer.*jar\|minecraft_server.*jar" | head -n 1) nogui'

#ExecReload=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "reload"\\015'

ExecStop=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "say SERVER SHUTTING DOWN. Saving map..."\\015'
ExecStop=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "save-all"\\015'
ExecStop=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "stop"\\015'
ExecStop=/bin/sleep 10

Restart=on-failure
RestartSec=60s

[Install]
WantedBy=multi-user.target

#########
# HowTo
#########
#
# Create a directory in /opt/minecraft/XX where XX is a name like 'survival'
# Add minecraft_server.jar into dir with other conf files for minecraft server
#
# Enable/Start systemd service
#    systemctl enable minecraft@survival
#    systemctl start minecraft@survival
#
# To run multiple servers simply create a new dir structure and enable/start it
#    systemctl enable minecraft@creative
# systemctl start minecraft@creative

在 ExecStart 命令的正上方，您可以看到一个带有 strace 的注释掉的命令。我进行了足够的研究以弄清楚如何将其放入，但我几乎无法阅读它。跟踪很长，所以除非有人要求，否则我不会添加它；也就是说，这里是引发某种错误的跟踪的所有结果。

81270 arch_prctl(0x3001 /* ARCH_??? */, 0x7ffc8a212000) = -1 EINVAL (Invalid argument)
81270 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
81270 access("/opt/minecraft/.nethackrc", F_OK) = -1 ENOENT (No such file or directory)
81270 access("/opt/minecraft/.nethackrc", F_OK) = -1 ENOENT (No such file or directory)
81270 connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
81270 connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
81270 openat(AT_FDCWD, "/etc/shadow", O_RDONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
81270 openat(AT_FDCWD, "/etc/shadow", O_RDONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
81271 connect(3, {sa_family=AF_UNIX, sun_path="/run/screen/S-minecraft/81271.me"}, 34) = -1 ENOENT (No such file or directory)
81271 unlink("/run/screen/S-minecraft/81271.me") = -1 ENOENT (No such file or directory)
81271 ioctl(1, TCGETS, 0x7ffc8a210800)  = -1 ENOTTY (Inappropriate ioctl for device)
81271 stat("/opt/minecraft/.terminfo", 0x564c0619b900) = -1 ENOENT (No such file or directory)
81271 access("/etc/terminfo/s/screen", R_OK) = -1 ENOENT (No such file or directory)
81271 ioctl(2, TCGETS, 0x7ffc8a210800)  = -1 ENOTTY (Inappropriate ioctl for device)
81271 ioctl(2, TCGETS, 0x7ffc8a210790)  = -1 ENOTTY (Inappropriate ioctl for device)
81271 openat(AT_FDCWD, "/opt/minecraft/.screenrc", O_RDONLY) = -1 ENOENT (No such file or directory)
81271 stat("bash", 0x7ffc8a2107f0)      = -1 ENOENT (No such file or directory)
81271 openat(AT_FDCWD, "/dev/ptmx", O_RDWR) = 4
81271 connect(5, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
81271 connect(5, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
81271 chown("/dev/pts/1", 995, 5)       = -1 EINVAL (Invalid argument)
81272 access("/etc/terminfo/s/screen", R_OK) = -1 ENOENT (No such file or directory)
81272 execve("/usr/local/sbin/bash", ["bash", "-c", "sleep 999"], 0x564c0619ff10 /* 12 vars */) = -1 ENOENT (No such file or directory)
81272 execve("/usr/local/bin/bash", ["bash", "-c", "sleep 999"], 0x564c0619ff10 /* 12 vars */) = -1 ENOENT (No such file or directory)
81272 execve("/usr/sbin/bash", ["bash", "-c", "sleep 999"], 0x564c0619ff10 /* 12 vars */) = -1 ENOENT (No such file or directory)
81272 arch_prctl(0x3001 /* ARCH_??? */, 0x7ffede633760) = -1 EINVAL (Invalid argument)
81272 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
81272 ioctl(-1, TIOCGPGRP, 0x7ffede6335b4) = -1 EBADF (Bad file descriptor)
81272 stat("/usr/local/sbin/bash", 0x7ffede633220) = -1 ENOENT (No such file or directory)
81272 stat("/usr/local/bin/bash", 0x7ffede633220) = -1 ENOENT (No such file or directory)
81272 stat("/usr/sbin/bash", 0x7ffede633220) = -1 ENOENT (No such file or directory)
81272 getpeername(0, 0x7ffede6335b0, [16]) = -1 ENOTSOCK (Socket operation on non-socket)
81272 stat("/usr/local/sbin/sleep", 0x7ffede633110) = -1 ENOENT (No such file or directory)
81272 stat("/usr/local/bin/sleep", 0x7ffede633110) = -1 ENOENT (No such file or directory)
81272 stat("/usr/sbin/sleep", 0x7ffede633110) = -1 ENOENT (No such file or directory)
81272 arch_prctl(0x3001 /* ARCH_??? */, 0x7ffc09151430) = -1 EINVAL (Invalid argument)
81272 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)

有人有想法吗？我不清楚屏幕会话问题是什么或如何解决它。非常感谢大家的时间和想法。

systemd gnu-screen java minecraft 20.04
Martin Hope
Adithya Vikram
Asked: 2020-07-30 04:33:49 +0800 CST
  • 0

我最近从三重启动笔记本电脑（其他是 Windows 10 和 ubuntu 20.04）上卸载了 kali Linux，而不是 grub 2，它在引导过程中显示 Windows 和 ubuntu，我所看到的只是一个 GNU grub，我不知道该怎么做，当我输入'exit'我去windows并且无法进入ubuntu，我怎样才能找回grub 2，请帮助

grub2 boot gnu-screen kali gnu
Martin Hope
Thorvald
Asked: 2020-06-13 01:43:44 +0800 CST
  • 0

我正在screen我的 Ubuntu 服务器上使用该命令运行一组进程。这个想法是理想情况下不应取消该过程或有被错误取消的风险

我发现使用Ctrl+a d是一个非常危险的分离屏幕的热键，因为使用Ctrl+d会终止它。

有没有办法将分离热键更改为其他东西？例如，我可以将Ctrl+更改a d为Ctrl+q吗？

我尝试使用别名，但这不适用于键盘命令。

gnu-screen
Martin Hope
Kong
Asked: 2019-05-28 03:52:46 +0800 CST
  • 0

我是新手，所以如果我使用了错误的术语，我深表歉意。

我正在使用 Linux 并使用 ssh 功能连接到我的学校工作站。如果我运行一个程序并关闭终端，程序就会停止。我在询问 ubuntu 时读到我应该使用屏幕功能。但是，当我关闭屏幕时出现错误并且进程停止运行。我仍然可以重新连接到屏幕。

linux screen XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server "localhost:11.0"       after 4570 requests (4570 known processed) with 192 events remaining.
ssh gnu-screen
Martin Hope
Rmurphy
Asked: 2017-11-15 06:25:58 +0800 CST
  • 1

我在屏幕会话上运行 GNU Parallel 命令。不幸的是，我没有在命令末尾添加“&”来将其推送到后台。因此，我无法访问我的屏幕会话中的命令行。

我想终止并行，以便它停止创建新作业但完成当前正在运行的作业。我需要在屏幕外这样做，但我认为 screen -X 不会起作用，因为屏幕的命令行不接受新命令。

谢谢！

gnu-screen
Martin Hope
robjtede
Asked: 2015-07-08 11:21:13 +0800 CST
  • 4

正如标题所说，我想在我的无头盒子上设置 GNU 屏幕，这样当它启动时一些屏幕已经在运行。

我的.bashrc文件在第一次登录时运行屏幕，screen -xRR我希望htop自动打开各种日志。

是否也可以同时为屏幕分配标题？

gnu-screen
Martin Hope
Robert Gowland
Asked: 2010-11-09 07:06:20 +0800 CST
  • 2

.screenrc 文件允许用户指定他们希望在第一次运行屏幕时打开多个窗口。例如。

screen -t myWindowA 0 "" 
screen -t myWindowB 1 "-${SHELL}" 
screen -t myWindowC 2 "-${SHELL}"

我希望每个窗口先运行一些命令，例如：

screen -t myWindowA 0 "<go to directory a, source a.sh" 
screen -t myWindowB 1 "-${SHELL} <go to directory b, source b.sh>" 
screen -t myWindowC 2 "-${SHELL} <go to directoy c; start a watch on `ls -l`>"

有没有办法做到这一点？

请注意，这与此 issue类似，但又有所不同。

gnu-screen