best standalone firewall

After minimizing the installation of CentOS7, many ports are not opened by default and need to be opened by Firewall-cmd.Check firewall status# firewall-cmd--staterunningShutting down the firewall# systemctl Stop firewalld# Firewall-cmd--Statenot runningView open Ports List#

the virtual machine. Where is the problem? Because the socket is the code transplanted from other projects, I am worried that the Code may have bugs, so I checked it again and again to confirm that there is no problem. I also asked my boss to read it again, OK. I even suspected that there was a problem with the test tool. I also tried all the other methods of connecting the Virtual Machine network from nat to bridge. Finally, we recommend that you disable the

Set up hadhoop standalone mode in CentOS 1. Download The hadhoop installation package ghost.[Plain] view plaincopyprint? Gzip-dhadoop-2.7.0-src.tar.gz Tar-xvfhadoop-2.7.0-src.tar Subsequent operations must be performed under root.[SQL] view plaincopyprint? Suroot 2. Install ssh First, check whether ssh is installed. Rpm-qa | grep ssh If not, use Yum install sshIt is best to enable the ssh service again [Plain] view plaincopyprint? Servicessh

/O worker #1) [Info-org.apache.avro.ipc.netty Server$nettyserveravrohandler.handleupstream (nettyserver.java:171)] [id:0x9d115219,/127.0.0.1:3809:>/ 127.0.0.1:44444] disconnected2015-01-21 13:50:13,703 (New I/O worker #1) [Info-org.apache.avro.ipc.nettyservEr$nettyserveravrohandler.handleupstream (nettyserver.java:171)] [id:0x9d115219,/127.0.0.1:3809:>/ 127.0.0.1:44444] unbound2015-01-21 13:50:13,703 (New I/O worker #1) [info-org.apache.avro.ipc.nettyserver$ Nettyserveravrohandler.handleupstream

Reference documents:http://blog.csdn.net/inkfish/article/details/5168676http://493663402-qq-com.iteye.com/blog/1515275Http://www.cnblogs.com/syveen/archive/2013/05/08/3068044.htmlHttp://www.cnblogs.com/kinglau/p/3794433.htmlEnvironment: Vmware11 Ubuntu14.04 LTS, Hadoop2.7.1One: Create an account1. Create Hadoop groups and groups under Hadoop users[Email protected]:~$ sudo adduser--ingroup hadoop Hadoop2. Add to Sudoers inside[Email protected]:~$ sudo gedit/etc/sudoers3. Switch to a Hadoop user[E

Generally, the android applications we develop are based on activity and the Android system manages the life cycle of the program. However, sometimes we also want to control the process of the Program on our own. For example, if you only develop a console application like/system/bin/PM, it is not appropriate to use activity. Here I call this self-controlled process as a standalone Android program. There is no big difference between the development me

Cocos2dx standalone Mahjong (4) Mahjong logic 5. Simulate playing //// Main. CPP // majianglogictest /// created by tinyult on 14-8-16. // copyright (c) 2014 tinyult. all rights reserved. // # include Output: Chaotic initial card heap 0x25 0x13 0x1 0x3 0x21 0x43 0x54 0x14 0x9 0x12 0x13 0x8 0x31 0x24 0x13 0x31 0x6 0x4 0x28 0x31 0x34 0x18 0x7 0x27 0x15 0x18 0x51 0x11 0x42 0x12 0x28 0x2 0x57 0x25 0x16 0x4 0x33 0x15 0x18 0x21 0x42 0x33 0x29 0x41 0x25 0x

Cocos2dx standalone Mahjong (III) Mahjong logic 4. Obtain card data We have saved a one-dimensional array. Similar to a table, we can calculate the number of all cards, but how can we get the cards in our hands? // Poker Conversion Byte switchtocarddata (byte cbcardindex [max_index]/* input table for counting the number of all cards */, byte cbcarddata [max_count]/* outgoing hand card data */) { // Convert poker Byte cbposition = 0; For (byte I = 0;

1. What is mahout? Mahout is an open-source project (http://mahout.apache.org/) of Apache that provides several classic algorithms in the machine learning field, allowing developers to quickly build machine learning and data mining applications. Mahout is based on hadoop. The name is also very interesting. hadoop is the name of an elephant, while mahout is like a husband and a viewer. It can be seen that the two are closely related. (This naturally reminds me of sun and eclipse ...) At this ti

), leading to data communication problems between worker nodes, task Scheduling is affected. Ii. Kafka performance bottleneck When Kafka is integrated with storm, the data processing performance is not very good and does not meet the expected requirements. I initially suspected that it was a kafkaspout code problem, but storm external has included it. I don't think the problem is here. Then, let's take a look at kafkaspout implementation and find possible performance bottlenecks. To increase

Chaincode program, named T3SSH // Enter virtual machine core_peer_address=172.17. 0.3:7051'{"Args": ["Init"]}'// deployment ChaincodePrint at T2 Terminal:02:07:10.906 [Shim] Debu: [mycc01]received message INIT from Shim02:07:10.906 [Shim] Debu: [Mycc01]handling chaincodemessage of Type:init (state:established)02:07:10.907 [Shim] debu:entered State init02:07:10.907 [Shim] Debu: [mycc01]received INIT, initializing Chaincode02:07:10.908 [Shim] Debu: [Mycc01]init succeeded. Sending completed02:07:1

Install and use Git standalone version Introduction: Git is an open-source distributed version control system. It is one of the most popular and advanced version control software today.Git is a distributed version control system. On the contrary, SVN is a centralized version control system. Each time SVN changes a file, it must be submitted to the server for storage, and Git has a complete local version library. 1. Install Git 1. Linux (CentOS) Shell>

$ export DISPLAY =: 0.0 // This is the case for installing on the local machine. If it is on another terminal, change it to export DISPLAY = ip: 0.0, this is because 127.0.0.1 of the local machine is omitted. 3. Execute the graphical interface installation steps: Step 1: do not check the check box, do not fill in the email, directly go to the next step, ignore the pop-up warning box (no email warning is provided) The pop-up warning is as follows: Step 2: select the installation type (cr

Oracle standalone environment enables automatic database startup upon startup In both Windows and Unix environments, Oracle databases can be automatically started. In Windows: The experiment method is relatively simple. It can be implemented by modifying the registry or using the oradim command: Oradim-edit In Unix: Experiment with the dbstart command that comes with the database. Command: dbstart + {full path of ORACLE_HOME} Principle: 1. When the o

Sometimes we need to invoke different versions of Python packages and modules in our program, so we can use Virtualenv's virtual environment to help us isolate them, so let's take a look at installing Windows with virtualenv to create a standalone Python environment 0. When will the virtualenv be used?Suppose that the two applications in the system, where a application to the library Libfoo version requirements of 1, and B application to the same lib