linux check uptime

Check the number of physical CPUs, cores, logical CPUs, and linuxcpu in linux. I. First, we need to clarify the concept of the number of physical CPUs, the number of cores, and the number of logical CPUs. 1. Number of physical CPUs: the number of CPUs actually inserted on the motherboard. You can specify the number of unique physical IDS (physical id) 2. Number of cpu cores: Number of chipsets that can p

Since I have recently studied the application and development of QT, the first step is to build a development environment. However, it is found that the hard disk space allocated to the virtual machine is obviously insufficient, resulting in the installation of qt_sdk failure. As a result, I searched the internet for methods to expand the hard disk space, and browsed countless websites. However, there were two basic ideas: 1. The hard disk space is extended on the basis of the original hard

hostUse the NC command to test the connectivity of UDP ports:Syntax: nc-z-v-u The following are examples of connectivity successes:[Email protected] ~]# nc-z-v-u 192.168.56.12 123 Connection to 192.168.56.12 123 port [UDP/NTP] succeeded!NC command syntaxNC [-hlnruz][-gNC Command Parameter Interpretation-N directly specifies the IP address, not through the domain name resolution-V Show Instruction execution process-U using UDP protocol-Z uses 0 input/output mode, only when scanning communication

, you can use [a-z],[a-z],[0-9] and other ways to write,If our request string is digital and English, change to: [A-za-z0-9]3. Beginning and end of line4, any one byte. With repeating bytes * Sz Send file to Local SZ filename After executing the command, select Save path in the pop-up box Rz Uploading files locally to the server Rz After executing the command, select the file you want to upload in the pop-up box Cd to c

When our Linux system fails to boot, it is often necessary to go into single-user mode to modify some of the configuration files, or to adjust some parameters. However, after entering the single-user mode, our/file system is read-only mode, can not be modified, then we need to use a command: mount–o remount,rw/This command to make our/path file system into a readable mode, so that the free modification can be achieved.Linux File System

Linux systems use Arp-scan to check for IP address conflictsIf the IP address planning is not good, even if there is a unified IP address will make mistakes! Recommended server IP address use to register details, the last computer room batch deployment server, will have been reused IP and assigned to another server, fortunately, the business has not caused great impact.So when configuring IP for the server,

Article Title: How to check memory leakage in Linux. Linux is a technology channel of the IT lab in China. Including desktop applications, Linux system management, kernel research, embedded systems and open-source systems. call void mtrace (void) (in the mcheck. in h? With declarations ). Mtrace installs hooks for func

Sometimes new Linux users are very confused when downloading software, because the download page often provides 32-bit and 64-bit software at the same time. So it is very important to know whether your operating system is 32-bit or 64-bit, because you need this information when doing many things. In this article Sometimes new Linux users are very confused when downloading software, because the download page

If you see that MySQL consumes a lot of cpu, you can use the MySQL client tool to check. Run usrlocalmysqlbinmysql-hlocalhost-uroot-p in Linux. If you see that MySQL consumes a lot of cpu, you can use the MySQL client tool to check. Run/usr/local/mysql/bin/mysql-hlocalhost-uroot-p in Linux. I have been using the M

How to check whether the Linux server is under DDOS attack or linuxddos Address: http://www.phpthinking.com/archives/427 Log on to your server and run the following command as the root user to check whether your server is under DDOS Attack:netstat -anp |grep 'tcp\|udp' | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort –nThis command displays the list of th

1. the MySQL daemon is mysqld. If it has been installed: [Root @ localhost ~] # Service mysqld startStart MYSQL: [OK] If not installed: [Root @ localhost ~] # Service mysqld startMysqld: unrecognized service You can check whether your service has been added to Linux. [Root @ localhost ~] # Chkconfig -- list mysqldMysqld 0: Disabled 1: Disabled 2: Disabled 3: Disabled 4: Disabled 5: enabled 6: Disabled If no

This article describes how to check the synchronization status of mysql using php in linux. it is a practical technique for detecting the synchronization status of mysql using php in Linux and has some reference value, for more information about how to check mysql synchronization status in

Check the system password file in Linux and check the file modification date. [Root @ Fedora ~] # Ls-l/etc/passwd View privileged users in the passwd file [Root @ fedora ~] # Awk-F: '$3 = 0 {print $1}'/etc/passwd Check whether there is a blank password account in the system. Awk-F: 'length ($2) = 0 {print $1} '/et

Linux self-starting service check-Linux Enterprise Application-Linux server application information. The following is a detailed description. In linux, each service has a corresponding running script, which can be used to set the startup, stop, restart, and query service inf

path of the file corresponding to this FD? No such API is provided in Linux, FreeBSD, or other UNIX systems. What should I do? Let's think from another angle: Is there any software in UNIX that can obtain the files opened by the process? If you have rich experience, it is easy to think of lsof. You can use it to know which files are opened by the process or a documentWhich process is opened. Okay, let's use a small program to test lsof and see how it

Check the CPU and memory load in linux. $ Vmstatprocs ----------- memory ---------- --- swap -- ----- io ---- system -- ----- cpu ------ r B swpd free buff cache si so bi bo in cs us sy id wa st 1 4 329796 26040 4528 1 50 160 36 17 2 10 85 3 0 results are explained as follows: the procsr column indicates the number of processes that run and wait for the cpu time slice. If the number is greater than 1 for a

[Practice OK] in Linux, check the context of environment variables when the process (program) is started. because of the recent installation of jira In Linux, a Chinese plug-in is installed. once it is set to start, it is in English, and after the terminal restarts again, it seems that the plug-in takes effect, and it is restored to normal Chinese... [practice OK

I wrote a script to check whether MySQLREPLICATION's SLAVE is normal in Linux, which is relatively simple. If you want to run it with CRONTAB, remove the Read part. 1. Script I wrote a script to check whether the SLAVE of MySQL REPLICATION is normal in Linux, which is relatively simple. If you want to run it with CRONT

Tags: CVE. sh org mic spec var position master ScriptSummary of the CVEs in Spectre Meltdown checkercve-2017-5753 bounds check bypass (Spectre Variant 1) Impact:kernel All Software Mitigation:recompile software and kernel with a modified compiler this introduces the Lfence opcode at the proper positio NS in the resulting code Performance impact of the mitigation:negligible CVE-2017-5715 Branch Target Injection (Spectre Variant

Linux configure: error: xml2-config not found. Please check your libxml2 installation, xml2-configlibxml2Problem: When downloading and installing the source code packageProblem package link: Php5.3.22 source code packageProblem description: Linux installation files are divided into: source code package (tar.gz.pdf and non-source code package (rpm,deb,tar.gz of no