I have three centos servers. Through the shell script, I want A to execute a .sh script in C and B to execute a script, and then send their generated files to C after An and B have finished executing. Because the compilation and execution time is very l...
operating system: windows server2008 R2 uses virtualbox5.12 accidentally delete vdi files, snapshots are still there, how to restore ...
question 1: subtitle of p33 page in the book: leave spaces and line breaks by quoting sub-shell. there are three lines in text.txt, with one number per line, such as 1 2 3 1 2 3 using out=$ (cat text.txt) echo $out to lose line feeds, and using t...
python * * py & is this how I run, or is it disconnected? ...
1. Recently, I encountered a strange thing when I configured adsl dialing on linux. When adding vlan to linux, the VLAN Dev name of vlan normally ends with [network card .xx]. As a result, mine ends with [renamexx], which is directly above the figure. ...
when you ask this question, you usually give the answer to these questions 1, how the nginx server removes the index.php in url 2, how the nginx server URL cannot automatically add index.php 3, and how nginx hides the index.php or .php path . what I...
Job for vsftpd.service failed because the control process exited with error code. See "systemctl status vsftpd.service " and "journalctl-xe " for details. this is my configuration anonymous_enable=YES local_enable=YES write_enable=YES local_um...
for work reasons, I used the strace command to track the whole process of curl and wget requests, and the conclusion about DNS domain name resolution is as follows. Some of them do not understand, and the source code does not understand (operation and m...
at present, I have a website with both static and dynamic interfaces. I wonder if I can build a tomcat cluster on a server and then use nginx to configure load balancers. Can I increase the number of concurrency of this website? Server environment: gene...
problem description look at the server system resources and find that 80% of the memory has been eaten by a process, and then navigated to a PHP process. so how can I continue to locate and find the code location, or the file? ...
main server jps shows DataNodeDataNode jps: dead nodes is displayed as 0 ...
the time is as follows: every day 08 30,10 code 10, 10:40 < time > how to write it out with one command? can you write multiple arbitrary time points, for example: 2018-12-03 14 purge 09, 2019-03-22 15:17 ...
I originally wanted to configure https, and there was a problem, but now I can t access it by http. It automatically becomes https, every time. refer to an in-site article when configuring: https: codeshelper.com a 11. ip access is normal, but I wa...
in Linux, when using the shutdown command, it is often used to shut down the system: shutdown -h (Linux) shutdown -r then why is it rare to see: shutdown -hr am I ill-informed? so let s just say: shutdown -r ...
Why is this problem? ping is not available (ping one of Baidu s ip) $ ping 220.181.57.216 PING 220.181.57.216 (220.181.57.216) 56(84) bytes of data. --- 220.181.57.216 ping statistics --- 80 packets transmitted, 0 received, 100% packet loss, time 78...
want to understand a problem, that is, the principle of domain name resolution, is there any easy-to-understand explanation? for example, when I use PHPstudy to develop a website, I don t have a DNS service locally, but after configuring a virtual ho...
A stand-alone server for fastdfs has been built in the internal network, and ip, is mapped through the public network to be accessed by the external network. When the fastdfs of the internal network uploads new images to the server, the public network ca...
sellerCnt = > seller_cnt minPriceOne= > min_price_one as mentioned above, the effect is like this. Change uppercase letters to lowercase, and then add a _ how to encapsulate a function before uppercase letters. I ve tried it several times, but it s ...
basic environment: 1. Host win7, has a fixed IP, for example: 10.1.18.9 2. Virtual machine centos7 requirements: 1. Virtual machines are not required to surf the Internet 2. Host and virtual machine communicate with each other Action: I set hos...
the, load average load with 16 cores of cpu is stable at about 12. check with top that there are no processes with high cpu usage. how can I find out what the problem is? with three consecutive screenshots, you can see that php-fpm and nginx take up ...
how should Ajax be used in LayUI data tables? does not use a MVC structure. would like to be more detailed, the newcomer uses Ajax for the first time. personal understanding: Json returns after passing a value in the form of: data post to url dat...
if I enter annual salary above 30K the length judged by the length attribute is 7 . my database code is utf8mb4, and the length of a Chinese character is equivalent to 4 , but if this field is stored in the database, it is equivalent to 19 . add m...