我在systemd中启用了pcieserver.service，它会触发/opt/pcieserver/pcieserver.sh脚本，并且看起来工作正常。
我面临的一个问题是，该服务器使用nc（netcat）读取套接字并将数据转储到/ tmp / temp文件中；如果我使用sudo /opt/pcieserver/pcieserver.sh命令运行此脚本，然后触发nc转储数据，则会创建临时文件，并按预期转储数据。如果我从systemd服务运行时触发了nc，它将生成文件，但是没有转储数据，即始终保持为0kb。
位于/etc/systemd/system/pcieserver.service下的systemd服务文件
内容：
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=PCIe-Server
After=network.target
[Service]
Type=simple
ExecStart=/opt/pcieserver/pcieserver.sh
Restart=on-failure
RestartSec=30
[Install]
WantedBy=multi-user.target
pcieserver.sh内容：
# Getting Script Directory
SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
cd ${SCRIPT_DIR}
/usr/bin/sudo python ${SCRIPT_DIR}/pcieserver.py
journalctl输出：
pcieserver.startLocalTrace[26859]: startLocalTrace function...
pcieserver.sh[26851]: 2018-12-24 06:57:38,169 startLocalTrace function...
pcieserver.sh[26851]: 2018-12-24 06:57:38,170 Delete local Trace:/tmp/trace
pcieserver.deleteLocalTrace[26859]: Delete local Trace:/tmp/trace
pcieserver.sh[26851]: 2018-12-24 06:57:38,170 Tracefile /tmp/trace exists, delete...
pcieserver.deleteLocalTrace[26859]: Tracefile /tmp/trace exists, delete...
pcieserver.sh[26851]: 2018-12-24 06:57:38,170 Tracefile /tmp/trace exists, delete...done
pcieserver.sh[26851]: 2018-12-24 06:57:38,170 Start local Trace to file /tmp/trace...
pcieserver.deleteLocalTrace[26859]: Tracefile /tmp/trace exists, delete...done
pcieserver.sh[26851]: 2018-12-24 06:57:38,170 Start local Trace to file /tmp/trace. Command:nc 127.0.0.1 4705 >/tmp/trace
pcieserver.sh[26851]: 2018-12-24 06:57:38,170 Start process:nc 127.0.0.1 4705 >/tmp/trace
pcieserver.startLocalTrace[26859]: Start local Trace to file /tmp/trace...
pcieserver.startLocalTrace[26859]: Start local Trace to file /tmp/trace. Command:nc 127.0.0.1 4705 >/tmp/trace
pcieserver.startProcess[26859]: Start process:nc 127.0.0.1 4705 >/tmp/trace
pcieserver.startLocalTrace[26859]: Start local Trace to file /tmp/trace...started
pcieserver.sh[26851]: 2018-12-24 06:57:38,176 Start local Trace to file /tmp/trace...started
sudo[4121]: root : TTY=unknown ; PWD=/opt/pcieserver ; USER=root ; COMMAND=/bin/nc 127.0.0.1 4705
sudo[4121]: pam_unix(sudo:session): session opened for user root by (uid=0)
P.S。我检查了两种情况下的权限是否相同。