- ps -ef | grep 进程名
根据进程名查找PID
[root@** idt-app]# ps -ef | grep java
root 2612 1 0 Feb09 ? 00:22:30 java -Xms7000m -Xmx7000m -jar idt-shelf-db-0.0.1-SNAPSHOT.jar
root 24674 24610 0 23:11 pts/3 00:00:00 grep --color=auto java
其中2612就是PID
- netstat -nap | grep PID
根据PID查看开启的端口
[root@** idt-app]# netstat -nap | grep 2612
tcp 0 0 0.0.0.0:18080 0.0.0.0:* LISTEN 2612/java
unix 2 [ ] STREAM CONNECTED 215368 2612/java
unix 2 [ ] STREAM CONNECTED 166613 2612/java
其中18080就是端口
- netstat -nap |grep port
根据端口查找对应的进程
[root@** ~]# netstat -nap |grep 18080
tcp 0 0 0.0.0.0:18080 0.0.0.0:* LISTEN 24680/java
[root@** ~]# ps -ef |grep java
root 24680 24610 3 23:17 pts/3 00:00:06 java -jar idt-shelf-db-0.0.1-SNAPSHOT.jar
root 24738 24713 0 23:20 pts/4 00:00:00 grep --color=auto java
- ps -elf | grep PID
根据pid查看进程的详细信息
[root@** ~]# ps -elf|grep 24680
0 S root 24680 24610 1 80 0 - 1130740 futex_ 23:17 pts/3 00:00:06 java -jar idt-shelf-db-0.0.1-SNAPSHOT.jar
0 S root 24740 24713 0 80 0 - 28177 pipe_w 23:23 pts/4 00:00:00 grep --color=auto 24680
- ifconfig -a
用于查看ip等信息
[root@** ~]# ifconfig -a
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.21.111.111 netmask 255.255.240.0 broadcast 172.21.111.255
ether 00:16:3e:12:5f:e2 txqueuelen 1000 (Ethernet)
RX packets 8315054 bytes 1864693178 (1.7 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7667386 bytes 3912383720 (3.6 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
- ping
用于查看网络故障，及测试一台主机到另外一台主机的网络是否连通
[root@** ~]# ping www.baidu.com
PING www.a.shifen.com (14.215.177.38) 56(84) bytes of data.
64 bytes from 14.215.177.38 (14.215.177.38): icmp_seq=1 ttl=52 time=8.44 ms
64 bytes from 14.215.177.38 (14.215.177.38): icmp_seq=2 ttl=52 time=8.58 ms
--- www.a.shifen.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 8.446/8.516/8.586/0.070 ms
- telnet IP PORT
本地计算机连接上远程主机
nslookup 检测网络中DNS服务器能否正确解析域名
windowns 自带的工具，linux下需要另外安装 yun install -y bind-uitls
[root@** ~]# nslookup baidu.com
Server: 100.100.2.136
Address: 100.100.2.136#53
Non-authoritative answer:
Name: baidu.com
Address: 220.181.38.148
Name: baidu.com
Address: 220.181.38.251
- traceroute
查看网络路由链路链路从1开始，每行记录代表网络一跳（进过网关一次或者路由一次，后面的单位为毫秒，指的是路由一次需要多少时间。
[root@*** ~]# traceroute imagedt.com
traceroute to imagedt.com (47.107.15.88), 30 hops max, 60 byte packets
1 * * *
2 * * *
3 11.0.50.25 (11.0.50.25) 1.638 ms 11.0.50.33 (11.0.50.33) 1.991 ms 11.0.50.41 (11.0.50.41) 1.734 ms
4 * * *
5 116.251.107.178 (116.251.107.178) 17.668 ms 17.676 ms *
6 * * *
7 * * *
- nmap
查看本机有哪些端口对外提供服务，或者哪些端口对外开放
[root@geoNode1 ~]# nmap -v -A 127.0.0.1
Starting Nmap 6.40 ( http://nmap.org ) at 2022-04-01 23:29 CST
NSE: Loaded 110 scripts for scanning.
NSE: Script Pre-scanning.
Initiating SYN Stealth Scan at 23:29
Scanning localhost (127.0.0.1) [1000 ports]
Discovered open port 22/tcp on 127.0.0.1
Completed SYN Stealth Scan at 23:29, 0.02s elapsed (1000 total ports)
Initiating Service scan at 23:29
Scanning 1 service on localhost (127.0.0.1)
Completed Service scan at 23:29, 0.01s elapsed (1 service on 1 host)
Initiating OS detection (try #1) against localhost (127.0.0.1)
NSE: Script scanning 127.0.0.1.
Initiating NSE at 23:29
Completed NSE at 23:29, 0.05s elapsed
Nmap scan report for localhost (127.0.0.1)
Host is up (0.000013s latency).
Not shown: 999 closed ports
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.4 (protocol 2.0)
| ssh-hostkey: 2048 5a:20:3e:64:b6:76:16:50:06:b3:5f:50:31:21:c3:8d (RSA)
|_256 83:ec:60:45:58:be:75:0f:96:61:98:2e:f7:5a:18:76 (ECDSA)
Device type: general purpose
Running: Linux 3.X
OS CPE: cpe:/o:linux:linux_kernel:3
OS details: Linux 3.7 - 3.9
Uptime guess: 1.811 days (since Thu Mar 31 04:01:25 2022)
Network Distance: 0 hops
TCP Sequence Prediction: Difficulty=262 (Good luck!)
IP ID Sequence Generation: All zeros
NSE: Script Post-scanning.
Initiating NSE at 23:29
Completed NSE at 23:29, 0.00s elapsed
Read data files from: /usr/bin/../share/nmap
OS and Service detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 1.87 seconds
Raw packets sent: 1022 (45.778KB) | Rcvd: 2043 (87.024KB)
