监听tcp 127.0.0.1:9090: bind: address已在使用

Question

如何发现哪个服务正在使用端口？

# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 7.6 (Maipo)
# netstat -natpv | grep 9090
tcp6       0      0 :::9090                 :::*                    LISTEN      1/systemd           
# 

请给我建议。

# systemctl status cockpit.service 
● cockpit.service - Cockpit Web Service
   Loaded: loaded (/usr/lib/systemd/system/cockpit.service; static; vendor preset: disabled)
   Active: inactive (dead) since Mon 2019-06-10 12:43:51 EDT; 4 days ago
     Docs: man:cockpit-ws(8)
 Main PID: 15922 (code=exited, status=0/SUCCESS)

Jun 10 12:41:48 X.X.X systemd[1]: Starting Cockpit Web Service...
Jun 10 12:41:48 X.X.X systemd[1]: Started Cockpit Web Service.
Jun 10 12:41:48 X.X.X cockpit-ws[15922]: Using certificate: /etc/cockpit/ws-certs.d/0-self-signed.cert
Jun 10 12:42:05 X.X.X cockpit-session[16311]: pam_ssh_add: Identity added: /root/.ssh/id_rsa (/root/.ssh/id_rsa)
Jun 10 12:42:07 X.X.X cockpit-ws[15922]: logged in user session
Jun 10 12:42:07 X.X.X cockpit-ws[15922]: New connection to session from 10.52.208.221
Jun 10 12:42:21 X.X.X cockpit-ws[15922]: WebSocket from 10.52.208.221 for session closed
Jun 10 12:42:36 X.X.X cockpit-ws[15922]: session timed out
# lsof -i :9090
COMMAND PID USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
systemd   1 root   75u  IPv6 7761202      0t0  TCP *:websm (LISTEN)
# 

Answer 1

systemctl list-sockets应该显示确切的单位名称和相关服务。

LISTEN                          UNIT                            ACTIVATES
[::]:9090                       cockpit.socket                  cockpit@0.service

Answer 2

不太理想，但总比什么都没有好：

# systemctl | grep listening
dm-event.socket                                                                                       loaded active     listening    Device-mapper event daemon FIFOs
iscsid.socket                                                                                         loaded active     listening    Open-iSCSI iscsid Socket
iscsiuio.socket                                                                                       loaded active     listening    Open-iSCSI iscsiuio Socket
lvm2-lvmpolld.socket                                                                                  loaded active     listening    LVM2 poll daemon socket
systemd-initctl.socket                                                                                loaded active     listening    /dev/initctl Compatibility Named Pipe
systemd-shutdownd.socket                                                                              loaded active     listening    Delayed Shutdown Socket
virtlockd.socket                                                                                      loaded active     listening    Virtual machine lock manager socket
virtlogd.socket                                                                                       loaded active     listening    Virtual machine log manager socket
# 

在我的例子中，是cockpit.socket (而不是cockpit.service)