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--- linux_basic_admin [2019/10/18 20:04] – external edit 127.0.0.1
+++ linux_basic_admin [2020/08/28 15:35] (current) – andonovj
@@ Line 52: / Line 52: @@
 pcs cluster enable --all
 </sxh>
+=====List Services=====
+You can list services in Linux as follows:
+<Code:bash|List services>
+[root@tain-cx-uatdb1 ~]# systemctl list-unit-files
+UNIT FILE                                     STATE
+proc-sys-fs-binfmt_misc.automount             static
+dev-hugepages.mount                           static
+dev-mqueue.mount                              static
+proc-fs-nfsd.mount                            static
+proc-sys-fs-binfmt_misc.mount                 static
+sys-fs-fuse-connections.mount                 static
+sys-kernel-config.mount                       static
+sys-kernel-debug.mount                        static
+tmp.mount                                     disabled
+var-lib-nfs-rpc_pipefs.mount                  static
+brandbot.path                                 enabled
+systemd-ask-password-console.path             static
+systemd-ask-password-plymouth.path            static
+systemd-ask-password-wall.path                static
+session-1.scope                               static
+session-29975.scope                           static
+session-29979.scope                           static
+acpid.service                                 enabled
+arp-ethers.service                            disabled
+auditd.service                                enabled
+auth-rpcgss-module.service                    static
+autofs.service                                disabled
+</Code>
+====Check process connections====
+We can check if a process is making connection from outside as follows:
+<Code:bash|Check process connections>
+[root@ag-se-tlcasdb1 ~]#  lsof -i -a -p 4970
+COMMAND  PID   USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
+oracle  4970 oracle   16u  IPv6 37827976      0t0  TCP ag-se-tlcasdb1.net.tain.com:ncube-lm->172.25.2.12:43612 (ESTABLISHED)
+</Code>
+As we can see, that is very useful for oracle processes. When the connection HAS to create process also ON the local server.