官方 startup.sh 启动后 skywalking 出现问题 skywalking 也不会自动重启，配置 systemd 进程守护可以更好的在程序异常时自动重启
skywalking-oap
[Unit]
Description=skywalking-oap
After=syslog.target network.target remote-fs.target nss-lookup.target
[Service]
Type=forking
ExecStart=/data/work/apache-skywalking-apm-bin-es7/bin/oapService.sh
Restart=always
PrivateTmp=true
LimitNOFILE=65536
WorkingDirectory=/data/work/apache-skywalking-apm-bin-es7/bin
[Install]
WantedBy=multi-user.target
skywalking-webapp
[Unit]
Description=skywalking-webapp
After=syslog.target network.target remote-fs.target nss-lookup.target
[Service]
Type=forking
ExecStart=/data/work/apache-skywalking-apm-bin-es7/bin/webappService.sh
Restart=always
PrivateTmp=true
LimitNOFILE=65536
WorkingDirectory=/data/work/apache-skywalking-apm-bin-es7/bin
[Install]
WantedBy=multi-user.target