The main purpose of the script is to practice capturing signals in a Linux bash script, by practicing the use of functions, and by terminating a running program, subsequent processing of files opened by the program, and so on!Scripting Features:Ping IP within a network segment, detect which IP is online, which IP is no
The main purpose of the script is to practice capturing signals in a Linux bash script, by practicing the use of functions, and by terminating a running program, subsequent processing of files opened by the program, and so on!Scripting Features:Ping IP within a network segment, detect which IP is online, which IP is no
A+b for Input-output Practice (IV)Time limit:2000/1000 MS (java/others) Memory limit:65536/32768 K (java/others) total submission (s): 90793 Accepted Submission (s): 48215Problem Descriptionyour task is to Calculate the sum of some integers. Inputinput contains multiple test cases. Each test case is contains
=' 192.***.***.*** ', master_user=' Repl_user ', master_password= ' hj3**** ', master_log_file=' mysql-bin.000004 ', master_log_pos=7145; I will not explain the above parameters. I said it earlier.Restart MySQL, and then check that the slave thread is turned on:Note that the red box in the figure, two are yes, indicates the success of the Open.Slave_io_running:yesSlave_sql_running:yesIf one of them is no, it means that it is unsuccessful. You need to check the MySQL
history and then optimize them. On the other hand, we also made a real-time monitoring system to monitor processing conditions such as inflow, outflow data speed and so on. By monitoring the system alarm, it is convenient to operation the spark streaming real-time processing program. This small monitoring system mainly uses the Influxdb+grafana and so on realizes.4, our test network often appear can not fi
A+b for Input-output Practice (V)Time limit:2000/1000 MS (java/others) Memory limit:65536/32768 K (java/others) total submission (s): 67443 Accepted Submission (s): 45101Problem Descriptionyour task is to calculate the sum of some integers. Inputinput contains an integer n on the first line, and then n lines follow.Each line starts with an integer m, and then M integers follow in the same line. Outputfor ea
A+b for Input-output Practice (VII)Time limit:2000/1000 MS (java/others) Memory limit:65536/32768 K (java/others) total submission (s): 62483 Accepted Submission (s): 41718problem DescriptionYour task is to Calculate A + B.InputThe input would consist of a series of pairs of integers
Telescopic
Content:
Synchronized Quick Review
The improvement of the synchronized
Compare the scalability of Reentrantlock and synchronized
Condition variable
It's not fair
Conclusion
Resources
About the author
The evaluation of the paper
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Synchronization is not the enemy
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Some children's shoes often ask the same question in the group: How to customize the appearance of the wf4.0 activity. In fact, there are two ways to customize the appearance of the wf4.0 activity: one way I have achieved in the previous blog, see: wf4.0 practice (11): email notification; another method is described here. So this articleArticleIn, I will use these two methods to go to the simplest wf4.0 custom activity appearance example.
Method 1:U
define a member function with parametersHere, we redefine the Gradebook class, whose DisplayMessage member function takes the course name as part of the welcome message, and the new member function displaymessage specifies a formal parameter that represents the name of the course to be exported.Define class Gradebook with a member function, takes
]) {maxxx=Maxx[i]; }} printf ("\ n \ nthe maximum value of all the sub-arrays of the array:%d\n\n", maxxx); return 0;}Third, the experimental test resultsArray One: 7,-3,5,-10,-12Second set of arrays: 100,3,-20,-10,-12Iv. Harvest and experience after development of knot pairThis pair of development let me benefit, first of all two of us have the same purpose, although there are different ideas, but in the communication we are to
These days have been studying how to figure out, after a few days of thinking finally wrote a simple operation and maintenance of the prototype, the following paste out to share with you, because my data volume is small, so I directly from the client with the script to collect data, sent to the remote MySQL server, MySQL server deployed above, Django, combined with drawing tools to figure out:Monitoring top
. Modify environment variables:
Go to the configuration file as shown in:
Press "I" to enter the insert mode and add the scala environment compiling information, as shown in:
From the configuration file, we can see that we have set "scala_home" and set the scala bin directory to path.
Press the "ESC" key to return to normal mode, save and exit the configuration file:
Run the following command to modify the configuration file:
4. display the installed Scala version on the terminal,
Main topic:Very simple, just need to find the maximum depth of a binary tree, it seems that there is no time and space requirements.Solution Method:More simple, only need to follow the width first method to find, here I use a queue to save the node to be expanded, B to save a expanded node, and then use the T intermediate variable to exchange
The previous section applies an irregular virtual firewall that does not allow any traffic to pass through. Today we will add a rule to the firewall to allow SSH.Finally, we will compare the security group and the FWaaS.Let's add a firewall rule: Allow SSH.Click the "Add Rule" button on the Firewall Rules tab page.Name the new rule "Allow SSH", protocal select "TCP", Action is "Allow", Destination port/port
Step 1: Test spark through spark Shell
Step 1:Start the spark cluster. This is very detailed in the third part. After the spark cluster is started, webui is as follows:
Step 2: Start spark shell:
In this case, you can view the shell in the following Web console:
Step 3:Copy the spark installation directory "readme. md" to the HDFS system.
Start a new command terminal on the master node and go to
in/etc/hosts on slave2. The configuration is as follows:
Save and exit.
In this case, we can ping both master and slave1;
Finally, configure the ing between the host name and IP address in/etc/hosts on the master. The configuration is as follows:
At this time, the ping command is used on the master to communicate with the slave1 and slave2 machines:
It is found that the machines on the two slave nodes have been pinged.
Finally, let's test
Article title: a simple practice of NAT using IPtables in RHLE5 operating system. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
Implementation: The Linux host performs routing to achieve shared internet access for the subnet
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