MC1.21.1-forge-Ubuntu服务器启动报错：[main/ERROR] [minecraft/Main]: Failed to start the minecraft servernet
【解决】MC1.21.1-forge-Ubuntu服务器启动报错：[main/ERROR] [minecraft/Main]: Failed to start the minecraft servernet.minecraft.util.DirectoryLock$LockException: /home/minecraft/server/./world/session.lock: already
服务器系统：Ubuntu-20.04.1-x64
MC版本：1.21.1
MC服务器核心：forge-1.21.1-52.0.28
Q：首次使用nohup serve.sh & （后台执行命令）启动MC服务器，正常拉起服务，使用kill命令杀死该进程后，再次使用sh serve.sh（批运行命令）重新开启服务器，结果出现报错，如下：
[05:18:57] [main/ERROR] [minecraft/Main]: Failed to start the minecraft server
net.minecraft.util.DirectoryLock$LockException: /home/minecraft/server/./world/session.lock: already locked (possibly by other Minecraft instance?)
at TRANSFORMER/minecraft@1.21.1/net.minecraft.util.DirectoryLock$LockException.alreadyLocked(DirectoryLock.java:95) ~[forge-1.21.1-52.0.28-server.jar:?]
at TRANSFORMER/minecraft@1.21.1/net.minecraft.util.DirectoryLock.create(DirectoryLock.java:41) ~[forge-1.21.1-52.0.28-server.jar:?]
at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.level.storage.LevelStorageSource$LevelStorageAccess.<init>(LevelStorageSource.java:417) ~[forge-1.21.1-52.0.28-server.jar:?]
at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.level.storage.LevelStorageSource.validateAndCreateAccess(LevelStorageSource.java:350) ~[forge-1.21.1-52.0.28-server.jar:?]
at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.Main.main(Main.java:151) ~[forge-1.21.1-52.0.28-server.jar:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[?:?]
at SECURE-BOOTSTRAP/net.minecraftforge.fmlloader@1.21.1-52.0.28/net.minecraftforge.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:85) ~[fmlloader-1.21.1-52.0.28.jar!/:?]
at SECURE-BOOTSTRAP/net.minecraftforge.fmlloader@1.21.1-52.0.28/net.minecraftforge.fml.loading.targets.CommonLaunchHandler.lambda$makeService$0(CommonLaunchHandler.java:69) ~[fmlloader-1.21.1-52.0.28.jar!/:?]
at SECURE-BOOTSTRAP/cpw.mods.modlauncher@10.2.2/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:77) [modlauncher-10.2.2.jar!/:?]
at SECURE-BOOTSTRAP/cpw.mods.modlauncher@10.2.2/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:97) [modlauncher-10.2.2.jar!/:?]
at SECURE-BOOTSTRAP/cpw.mods.modlauncher@10.2.2/cpw.mods.modlauncher.Launcher.run(Launcher.java:116) [modlauncher-10.2.2.jar!/:?]
at SECURE-BOOTSTRAP/cpw.mods.modlauncher@10.2.2/cpw.mods.modlauncher.Launcher.main(Launcher.java:75) [modlauncher-10.2.2.jar!/:?]
at SECURE-BOOTSTRAP/cpw.mods.modlauncher@10.2.2/cpw.mods.modlauncher.BootstrapEntry.main(BootstrapEntry.java:17) [modlauncher-10.2.2.jar!/:?]
at net.minecraftforge.bootstrap@2.1.3/net.minecraftforge.bootstrap.Bootstrap.moduleMain(Bootstrap.java:188) [bootstrap-2.1.3.jar!/:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[?:?]
at net.minecraftforge.bootstrap.Bootstrap.bootstrapMain(Bootstrap.java:133) [bootstrap-2.1.3.jar:2.1.3]
at net.minecraftforge.bootstrap.Bootstrap.start(Bootstrap.java:53) [bootstrap-2.1.3.jar:2.1.3]
at net.minecraftforge.bootstrap.ForgeBootstrap.main(ForgeBootstrap.java:19) [bootstrap-2.1.3.jar:2.1.3]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[?:?]
at net.minecraftforge.bootstrap.shim.Main.main(Main.java:97) [forge-1.21.1-52.0.28-shim.jar:2.1.3]
Transformer Audit:
net.minecraft.server.Main
REASON: classloading
net.minecraft.util.DirectoryLock
REASON: classloading
net.minecraft.util.DirectoryLock$LockException
REASON: classloading
net.minecraft.world.level.storage.LevelStorageSource
REASON: classloading
net.minecraft.world.level.storage.LevelStorageSource$LevelStorageAccess
REASON: classloading
S：
第一次杀掉MC服务器的进程后，可能有部分遗留进程未被杀死。
利用 ps aux | grep minecraft 命令查询mc进程。如下：
root@ser:/home/minecraft# ps aux | grep minecraft
root 20985 0.0 0.0 8160 656 pts/3 S+ 05:21 0:00 grep --color=auto minecraft可见返回结果显示，确实有进程未被杀死，PID为20985。
利用 ps aux 命令查询当前全部进程。如下：
root@ser:/home/minecraft# ps aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.1 171492 12792 ? Ss Nov23 0:08 /sbin/init
root 2 0.0 0.0 0 0 ? S Nov23 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? I< Nov23 0:00 [rcu_gp]
root 4 0.0 0.0 0 0 ? I< Nov23 0:00 [rcu_par_gp]
root 6 0.0 0.0 0 0 ? I< Nov23 0:00 [kworker/0:0H-kblockd]
root 8 0.0 0.0 0 0 ? I< Nov23 0:00 [mm_percpu_wq]
root 9 0.0 0.0 0 0 ? S Nov23 0:00 [ksoftirqd/0]
root 10 0.0 0.0 0 0 ? I Nov23 0:29 [rcu_sched]
root 11 0.0 0.0 0 0 ? S Nov23 0:00 [migration/0]
root 12 0.0 0.0 0 0 ? S Nov23 0:00 [idle_inject/0]
root 14 0.0 0.0 0 0 ? S Nov23 0:00 [cpuhp/0]
root 15 0.0 0.0 0 0 ? S Nov23 0:00 [cpuhp/1]
root 16 0.0 0.0 0 0 ? S Nov23 0:00 [idle_inject/1]
root 17 0.0 0.0 0 0 ? S Nov23 0:00 [migration/1]
root 18 0.0 0.0 0 0 ? S Nov23 0:00 [ksoftirqd/1]
root 20 0.0 0.0 0 0 ? I< Nov23 0:00 [kworker/1:0H-kblockd]
root 21 0.0 0.0 0 0 ? S Nov23 0:00 [cpuhp/2]
root 22 0.0 0.0 0 0 ? S Nov23 0:00 [idle_inject/2]
root 23 0.0 0.0 0 0 ? S Nov23 0:00 [migration/2]
root 24 0.0 0.0 0 0 ? S Nov23 0:00 [ksoftirqd/2]
root 26 0.0 0.0 0 0 ? I< Nov23 0:00 [kworker/2:0H-kblockd]
root 27 0.0 0.0 0 0 ? S Nov23 0:00 [cpuhp/3]
root 28 0.0 0.0 0 0 ? S Nov23 0:00 [idle_inject/3]
root 29 0.0 0.0 0 0 ? S Nov23 0:00 [migration/3]
root 30 0.0 0.0 0 0 ? S Nov23 0:00 [ksoftirqd/3]
root 32 0.0 0.0 0 0 ? I< Nov23 0:00 [kworker/3:0H-kblockd]
root 33 0.0 0.0 0 0 ? S Nov23 0:00 [kdevtmpfs]
root 34 0.0 0.0 0 0 ? I< Nov23 0:00 [netns]
root 35 0.0 0.0 0 0 ? S Nov23 0:00 [rcu_tasks_kthre]
root 36 0.0 0.0 0 0 ? S Nov23 0:00 [kauditd]
root 37 0.0 0.0 0 0 ? S Nov23 0:00 [khungtaskd]
root 38 0.0 0.0 0 0 ? S Nov23 0:00 [oom_reaper]
root 39 0.0 0.0 0 0 ? I< Nov23 0:00 [writeback]
root 40 0.0 0.0 0 0 ? S Nov23 0:00 [kcompactd0]
root 41 0.0 0.0 0 0 ? SN Nov23 0:00 [ksmd]
root 42 0.0 0.0 0 0 ? SN Nov23 0:00 [khugepaged]
root 90 0.0 0.0 0 0 ? I< Nov23 0:00 [kintegrityd]
root 91 0.0 0.0 0 0 ? I< Nov23 0:00 [kblockd]
root 92 0.0 0.0 0 0 ? I< Nov23 0:00 [blkcg_punt_bio]
root 93 0.0 0.0 0 0 ? I< Nov23 0:00 [tpm_dev_wq]
root 94 0.0 0.0 0 0 ? I< Nov23 0:00 [ata_sff]
root 95 0.0 0.0 0 0 ? I< Nov23 0:00 [md]
root 96 0.0 0.0 0 0 ? I< Nov23 0:00 [edac-poller]
root 97 0.0 0.0 0 0 ? I< Nov23 0:00 [devfreq_wq]
root 98 0.0 0.0 0 0 ? S Nov23 0:00 [watchdogd]
root 101 0.0 0.0 0 0 ? S Nov23 0:00 [kswapd0]
root 102 0.0 0.0 0 0 ? S Nov23 0:00 [ecryptfs-kthrea]
root 104 0.0 0.0 0 0 ? I< Nov23 0:00 [kthrotld]
root 105 0.0 0.0 0 0 ? I< Nov23 0:00 [acpi_thermal_pm]
root 107 0.0 0.0 0 0 ? S Nov23 0:00 [scsi_eh_0]
root 108 0.0 0.0 0 0 ? I< Nov23 0:00 [scsi_tmf_0]
root 109 0.0 0.0 0 0 ? S Nov23 0:00 [scsi_eh_1]
root 110 0.0 0.0 0 0 ? I< Nov23 0:00 [scsi_tmf_1]
root 112 0.0 0.0 0 0 ? I< Nov23 0:00 [vfio-irqfd-clea]
root 114 0.0 0.0 0 0 ? I< Nov23 0:00 [ipv6_addrconf]
root 123 0.0 0.0 0 0 ? I< Nov23 0:00 [kstrp]
root 126 0.0 0.0 0 0 ? I< Nov23 0:00 [kworker/u9:0]
root 139 0.0 0.0 0 0 ? I< Nov23 0:00 [charger_manager]
root 188 0.0 0.0 0 0 ? S Nov23 0:00 [scsi_eh_2]
root 189 0.0 0.0 0 0 ? I< Nov23 0:00 [scsi_tmf_2]
root 191 0.0 0.0 0 0 ? I< Nov23 0:00 [kworker/0:1H-kblockd]
root 192 0.0 0.0 0 0 ? I< Nov23 0:00 [cryptd]
root 193 0.0 0.0 0 0 ? I< Nov23 0:00 [kworker/3:1H-kblockd]
root 260 0.0 0.0 0 0 ? I< Nov23 0:00 [raid5wq]
root 303 0.0 0.0 0 0 ? I< Nov23 0:00 [kworker/2:1H-kblockd]
root 304 0.0 0.0 0 0 ? S Nov23 0:01 [jbd2/vda1-8]
root 305 0.0 0.0 0 0 ? I< Nov23 0:00 [ext4-rsv-conver]
root 306 0.0 0.0 0 0 ? I< Nov23 0:00 [kworker/1:1H-kblockd]
root 381 0.0 0.7 101308 62152 ? S<s Nov23 0:14 /lib/systemd/systemd-journald
root 403 0.0 0.0 2488 508 ? S Nov23 0:00 bpfilter_umh
root 433 0.0 0.0 20252 6060 ? Ss Nov23 0:00 /lib/systemd/systemd-udevd
root 608 0.0 0.0 0 0 ? I< Nov23 0:00 [kaluad]
root 609 0.0 0.0 0 0 ? I< Nov23 0:00 [kmpath_rdacd]
root 610 0.0 0.0 0 0 ? I< Nov23 0:00 [kmpathd]
root 611 0.0 0.0 0 0 ? I< Nov23 0:00 [kmpath_handlerd]
root 612 0.0 0.2 280136 17948 ? SLsl Nov23 0:06 /sbin/multipathd -d -s
root 621 0.0 0.0 0 0 ? S Nov23 0:00 [jbd2/vdb1-8]
root 623 0.0 0.0 0 0 ? S< Nov23 0:00 [loop0]
root 625 0.0 0.0 0 0 ? I< Nov23 0:00 [ext4-rsv-conver]
root 633 0.0 0.0 0 0 ? S< Nov23 0:00 [loop2]
systemd+ 656 0.0 0.0 90888 6228 ? Ssl Nov23 0:00 /lib/systemd/systemd-timesyncd
systemd+ 698 0.0 0.0 19080 7432 ? Ss Nov23 0:00 /lib/systemd/systemd-networkd
systemd+ 700 0.0 0.1 24820 12424 ? Ss Nov23 0:00 /lib/systemd/systemd-resolved
root 734 0.0 0.0 237328 7332 ? Ssl Nov23 0:05 /usr/lib/accountsservice/accounts-da
root 737 0.0 0.0 8540 3064 ? Ss Nov23 0:00 /usr/sbin/cron -f
message+ 739 0.0 0.0 7568 4616 ? Ss Nov23 0:00 /usr/bin/dbus-daemon --system --addr
root 745 0.0 0.0 81928 3828 ? Ssl Nov23 0:02 /usr/sbin/irqbalance --foreground
root 747 0.1 0.7 709336 62580 ? Ssl Nov23 1:02 /opt/node-v14.19.1-linux-x64/bin/nod
root 749 0.0 0.6 916816 52084 ? Ssl Nov23 0:34 /opt/node-v14.19.1-linux-x64/bin/nod
root 752 0.0 0.2 29872 18268 ? Ss Nov23 0:00 /usr/bin/python3 /usr/bin/networkd-d
root 754 0.0 0.0 232732 6812 ? Ssl Nov23 0:00 /usr/lib/policykit-1/polkitd --no-de
syslog 755 0.0 0.0 224344 5104 ? Ssl Nov23 0:04 /usr/sbin/rsyslogd -n -iNONE
root 768 0.0 0.0 17752 8080 ? Ss Nov23 0:00 /lib/systemd/systemd-logind
root 776 0.0 0.1 393268 12408 ? Ssl Nov23 0:00 /usr/lib/udisks2/udisksd
daemon 782 0.0 0.0 3796 2268 ? Ss Nov23 0:00 /usr/sbin/atd -f
root 807 0.0 0.1 315112 11700 ? Ssl Nov23 0:00 /usr/sbin/ModemManager
root 808 0.0 0.0 7352 2312 ttyS0 Ss+ Nov23 0:00 /sbin/agetty -o -p -- \u --keep-baud
root 815 0.0 0.0 12188 7400 ? Ss Nov23 0:05 sshd: /usr/sbin/sshd -D [listener] 0
root 828 0.0 0.0 5828 1828 tty1 Ss+ Nov23 0:00 /sbin/agetty -o -p -- \u --noclear t
root 834 0.0 0.2 108140 20668 ? Ssl Nov23 0:00 /usr/bin/python3 /usr/share/unattend
root 1650 0.0 0.0 6808 3272 ? Ss Nov23 0:00 /usr/sbin/vsftpd /etc/vsftpd.conf
root 3552 0.0 0.1 19060 9680 ? Ss Nov23 0:00 /lib/systemd/systemd --user
root 3554 0.0 0.0 171540 3504 ? S Nov23 0:00 (sd-pam)
root 4873 0.0 0.0 8740 2628 ? Ss Nov23 0:00 SCREEN
root 4874 0.0 0.0 8960 3828 pts/1 Ss+ Nov23 0:00 /bin/bash
root 5666 0.0 0.0 8872 2588 ? Ss Nov23 0:00 SCREEN
root 5667 0.0 0.0 8960 4028 pts/2 Ss+ Nov23 0:00 /bin/bash
root 6347 0.0 0.0 0 0 ? I Nov23 0:00 [kworker/2:3-events]
root 8170 0.0 0.0 0 0 ? S< Nov23 0:00 [loop3]
root 8206 0.0 0.3 1468844 32208 ? Ssl Nov23 0:06 /usr/lib/snapd/snapd
root 8404 0.0 0.0 0 0 ? S< Nov23 0:00 [loop4]
root 8561 0.0 0.0 0 0 ? S< Nov23 0:00 [loop5]
root 16253 0.0 0.0 0 0 ? I 00:44 0:00 [kworker/3:0-events]
root 17614 0.0 0.0 0 0 ? I 01:34 0:02 [kworker/3:1-events]
root 17705 0.0 0.0 0 0 ? I 01:41 0:01 [kworker/1:1-events]
root 19629 0.0 0.0 0 0 ? I 04:38 0:00 [kworker/0:1-events]
root 20011 0.0 0.0 0 0 ? I 04:59 0:00 [kworker/u8:1-flush-252:0]
root 20046 0.0 0.0 0 0 ? I 05:04 0:00 [kworker/2:1-events]
root 20160 0.0 0.0 0 0 ? I 05:07 0:00 [kworker/1:2-mm_percpu_wq]
root 20163 7.4 12.8 9085660 1047588 ? Sl 05:08 1:03 java -Xmx5G -Xms1G -jar forge-1.21.1
root 20639 0.0 0.0 0 0 ? I 05:12 0:00 [kworker/2:0-events]
root 20640 0.0 0.0 0 0 ? I 05:12 0:00 [kworker/2:2-events]
root 20649 10.4 11.9 9074072 974568 ? Sl 05:13 0:53 java -Xmx5G -Xms1G -jar forge-1.21.1
root 20702 0.0 0.1 13912 9008 ? Rs 05:14 0:00 sshd: root@pts/3
root 20791 0.0 0.0 10032 5044 pts/3 Ss 05:14 0:00 -bash
root 20817 0.0 0.0 0 0 ? I 05:15 0:00 [kworker/0:2]
root 20858 0.0 0.0 0 0 ? I 05:15 0:00 [kworker/u8:0-events_power_efficient
root 20906 0.0 0.0 0 0 ? I 05:17 0:00 [kworker/3:2-events]
root 20907 0.0 0.0 0 0 ? I 05:17 0:00 [kworker/3:3]
root 20908 0.0 0.0 0 0 ? I 05:17 0:00 [kworker/2:4]
root 20982 0.0 0.0 0 0 ? I 05:21 0:00 [kworker/u8:2-events_unbound]
root 20988 0.0 0.0 10612 3256 pts/3 R+ 05:22 0:00 ps aux总览进程中，未发现PID为20985的进程。
返回查看报错内容：
[05:18:57] [main/ERROR] [minecraft/Main]: Failed to start the minecraft server
net.minecraft.util.DirectoryLock$LockException: /home/minecraft/server/./world/session.lock: already locked (possibly by other Minecraft instance?)
根据报错内容，使用 rm /home/minecraft/server/world/session.lock 命令删除对应文件。
root@ser:/home/minecraft# rm /home/minecraft/server/world/session.lock删掉报错文件后，重新启动服务器，拉起服务正常，服务器运行正常。
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