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 ...

main server jps shows DataNodeDataNode jps: dead nodes is displayed as 0 ...

problem description wrote a daemon with the PHP program, which takes up a lot of memory (% MEM:80%) and does not release it. I can only locate the PID, of this process, but I can t locate which piece of code in the program caused it. How can I find...

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...

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. ...

python * * py & is this how I run, or is it disconnected? ...

operating system: windows server2008 R2 uses virtualbox5.12 accidentally delete vdi files, snapshots are still there, how to restore ...

The problem goes something like this: mysql master-slave replication. After configuration, check that the slave table has a normal status: Slave_IO_Running: Yes Slave_SQL_Running: Yes then insert data into the master table without Synchronize, an...

question 1: obviously, when you install IPtable, query, you are prompted not to install question 2: Baidu said that you still need to install iptable-service, if you are uneasy, how to keep the rules saved after IPtable restart? Please forgive me if y...

cpu has a high load, which means there are more waiting processes, but cpu itself is idle or can handle other tasks, so why does the system change cards when the cpu load is high? ...

there is a server whose IP is 10.99.40.xxx, which is used to deploy the project, and a server with an IP of 10.99.1.x, which is used to store video images. if I want to access the server where the video images are stored on the project server. Should b...

is installed with yum on the Internet I. the software package required to install the NFS server: yum install-y nfs-utils then start the service directly with systemctl start nfs-server.service but I compiled and installed it, how do I start it?...

use rmtrash instead of rm, to do alias rm= bin rmtrash.sh in bashrc found that when a personal account uses rm, the files will be moved to the ~ .rmtrash folder, and the root account will also be moved to ~ .rmtrash under the root directory. but...

my server has Windows Server 2008 and CentOS7.2 installed on a disk. I restart my computer now and it automatically starts CentOS7.2. How can I choose to start them, such as if I want to start Windows Server 2008? ...

can Linux set whitelist according to specific port: 80 port setting 1.1.1.1 can be accessed, 88 port setting 2.2.2.2 can access this? ...

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problem description I scanned my blog with kitchen knife software, and then I couldn t access my blog, but I could access https normally. 1ping www.dreamate.topping2 380 debug by myself 4 I still can t access debug 5 other https projects o...

simulate a redis cluster on a linux host according to the tutorial https: redis.io topics clust... on the official website, where the command to set up the cluster is as follows: redis-cli --cluster create 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7...

want to automatically shield the attacker s IP, which is the temporary blacklist function of the security dog windows version of IP shown in the following picture looking for the description of the safety dog, linux s nginx security dog does not ...

I have a ubuntu physical machine with two network cards installed on it. Now the network cable is plugged into the 100-megabit network card enp2s0, and the gigabit network card network port enp1s0 is not plugged into the network cable, but checking the ...