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2025-01-28 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Servers >
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Monitoring command
The utmp file allows one to discover information about who is currently using the system. There may be more users currently using the system,because not all programs use utmp logging.
The wtmp file records all logins and logouts.
W is the information of utmp
Last is the information of wtmp. Which user logged in when, how, where, and for how long?
Login and logout records are in wtmp
The information of the currently logged-in user is recorded in the file utmp
W: monitor user uptime: display the first line
1. How long has the 2.up of the system not shut down? 3.4 users. How many users have logged in to 5.load average for 1 minute, 5 minutes and 15 minutes of load balancing, which mainly refers to the load of CPU and memory?
5.IDLE user idle time 6.JCPU cumulative occupied time depends on whether the user occupies too much CPU. What commands did the 7.PCPU user use CPU time 7.WHAT to execute, such as w or where to stay?
Who user name login terminal (tty local terminal pts1 remote terminal login time remote login address)
Users prints out the currently logged-in user on a separate line
Lastlog looks at the user's last login.
Lastlog-u 1 look at the login information of root users
Hostname view host name, computer room name-region-software function (web or database)-IP- cabinet name
Take effect permanently, change the document. / wtc/sysconfig/network
Top look at CPU resources
Top system time: how long does up start? the average user load (cannot exceed 2 times the number of CPU. Press 1 after top to see the number of CPU. Logical CPU, not real CPU).
The ID number of the PID process USER which user VIRT the virtual memory SHR the real memory S state, started or closed% CPU this process used how many CPU TIME+ how long the service has been running
Iftop watches the traffic of the network card
Yum install epel-release-y
Yum install iftop-y
-I set the network card for monitoring, such as # iftop-I eth2
-B displays traffic in bytes (default is bits), such as # iftop-B
-b to make the traffic graph bar display by default
TX: sending traffic
RX: receive traffic
TOTAL: total traffic
Cumm: total traffic from running iftop to the current time
Peak: peak traffic
Rates: indicates the average traffic in the past 2s, 10s, 40s respectively
If the traffic is too large, disable the IP that accounts for the traffic, or expand the bandwidth.
Cat / etc/issue look at the release information
Free-m look at memory, vmstat, cpu queue blocking, uptime, cpu iostat, io, read, iftop, traffic.
Tcpdump-nn port 80 nn is to display the network address-I eth0 adapter
Tcpdump-nn port 22 and host 192.168.0.116 to see what this machine has connected to port 22
If the centos6.6 is stuck in the selinux-policy-targeted package when installing swap, you need to add the swap partition
File system corruption
Fsck-y
Df is like opening my computer top is like opening a process manager
Uptime only looks at the first line of top
W
Ps
VSZ virtual memory footprint unit: kb
RSS actual memory footprint unit: kb
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