First, Concept chapter
In the introduction of troubleshooting DHCP before the first to clarify a few conceptual things, only theoretical enrichment, in order to better understand the following troubleshooting ideas.
First: What data can the DHCP service provide? The DHCP service is not omnipotent, he can only provide network-level-related parameters, such as IP address, mask address, gateway address, WINS
Tags: info troubleshooting alt Software Profiler COM sharing summary selectionRemember the previous customer in the use of software, there are occasional deadlock problems, because the time is uncertain, not good to reproduce the problem, at that time to solve the problem is a bit tricky.Here is a summary of the two common ways to look at deadlocks:The first is the graphical monitoring of:SQL Server Profiler--and tools--when you log on in the trace pr
following will describe the whole problem of the troubleshooting process.2. Principle of semi-synchronous replication MySQL Master repository is consistent through the Binlog log, the main library executes the transaction locally, the Binlog log is returned to the user after the disk is dropped, and the repository synchronizes the operations of the main library by pulling the main library binlog logs. By default, there is no strict synchronizatio
Tags: mysql error status MasterMySQL master-slave replication troubleshooting case One:Problem: master/slave cannot syncPhenomenon:master:mysql> show MASTER status;Empty Set (0.00 sec)Slave:mysql> show SLAVE status \g;Slave_io_running:connectingSlave_sql_running:yesSeconds_behind_master:nulllast_io_errno:1045Last_io_error:error Connecting to master '[email protected]: 3306 '-Retry-time:60 retries:86400Troubleshooting process:First, MASTER: [[email pro
Tags: boot inf CTRL drive technology config technology sharing user troubleshooting# #root用户密码的修改Press the up and down key to interrupt the boot, press "E" to enter the kernel bootThe linux16 line is deleted to the location shown on the way and modified;Press "Ctrl+x" to start when you have finished modifyingEnter the system to switch to the real environment, start to modify the root password, and create/. autorelable file;After completion, enter two
Just into a company, suddenly a direct throw to the public network development test machine, there is output traffic explosion 300m+, directly lead to server load high, IDC cacti monitoring reported traffic anomaly problem, the following is the troubleshooting process:1, vim/root/.bash_history # View root user operation command log file, any information is not, be clear2, vim/var/log/Secure # Check the log, found a lot of login failed to try to record
in a real-world production environment, you will often encounter servers CPU full problem, this time, the correct method of troubleshooting, help to quickly locate the problem. 1, find the most CPU -consuming process executes top , displays a list of process run information, and then type p ( uppercase p), the process follows the CPU The usage rate is sorted. 2. Find the thread that consumes the most CPUexecutes top-hp 8880, displays a list of thread
=INNODB;Disadvantage: If the single table is increased too large, such as more than 100G, performance will be affected. In this case, if you use shared tablespace, you can separate files, but there is also a problem, if the scope of access is too large to access multiple files, it will be slower. If you use a stand-alone table space, consider using partitioned tables to mitigate the problem to some extent. In addition, when you enable standalone tablespace mode, you need to adjust the settings o
Tags: Linux system troubleshooting Linux system Boot process boot directory recovery partition table information recovery for main sectorsLinux Boot SequenceThis diagram is a complete introduction to the Linux boot sequenceBelow I will tell you in detail a boot processThe first step is to load the BIOSWhen you turn on the computer, the computer will first load the BIOS information, which is called the power-on self test. This shows that the BIOS infor
It is very useful to know some troubleshooting methods for access networks, and it also gives us more convenience in actual use. So I have studied the specific implementation methods of access network troubleshooting, And I will share with you here, hoping it will be useful to you. As a comprehensive technology, network fault diagnosis involves many aspects of network technology. Before learning the concept
DHCP protocol troubleshooting problem. This time, we mainly aim at the failure of clients to obtain IP addresses through the DHCP server. In this regard, what problems should we pay attention to, as well as its analysis and specific handling steps? Next we will look at it in detail.
DHCP protocol troubleshooting ◆ Network Environment
As shown in. In this networking environment, you can configure a global ad
1. Serial Port troubleshooting
When a connectivity problem occurs in the serial port, in order to eliminate the serial port fault, the show interface serial command is generally used to analyze its screen output report content and locate the problem. The start of the serial port report provides the interface status and line protocol status. Possible Combinations of interfaces and line protocols are as follows:
1) serial port running and line protocol
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Memory troubleshooting tools and related documents introduction focus
1 procsysvmmin_free_kbytes
2 procsysvmdrop_caches
3 Procsysrq-trigger
31 interpretation of the echo m Procsysrq-trigger output
4 Cat Procslabinfo
5 Cat Procmeminfo
51 Important Information
6 Top Information
7 Free Command
8 other files in the PROCSYSVM directory
5. Memory
method in the maintenance of the computer. Replacement refers to using normal switch components to replace faulty parts, so as to find the fault point. It is mainly used for the diagnosis of hardware faults, but it should be noted that the replaced parts must be the same type of switches of the same brand and model.
Of course, in order to make the troubleshooting work follow the rules, you can analyze the faults according to the following principles.
Wireless troubleshooting is what we will explain the content of this article. To cut into our theme from four aspects. Includes whether it is a hardware issue, how the access point is connected, whether the device is configured incorrectly, and whether multiple access points are not in the customer list.
Wireless troubleshooting One, is a hardware problem
When there is a problem with the wireless network,
Faults in network applications are always overwhelming. So this time we will explain the IP protocol troubleshooting: The interface does not borrow the address. Let's look at the network structure.
IP protocol troubleshooting: Network Environment
During a test, configure the interface to borrow the IP addresses of other interfaces. The networking diagram is as follows.
Figure IP address borrow case network
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This topic describes troubleshooting steps for workflow manager 1.0 Publishing, management and execution. Publishing and managing workflowsi cannot publish any workflow activities
Follow the steps in the steps to verify that server is correctly set up. after you verified that the server is correctly set up, follow the steps in the steps to troubleshoot Workflow Management Service then retry your action
After we set up a small Internet cafe, network maintenance is very important to make it work properly. Due to the complexity of network protocols and network equipment, it is not as easy to solve many faults as solving single-host faults. The identification and elimination of network faults require both long-term knowledge and experience, a series of software and hardware tools, and your wisdom. Therefore, every network administrator should learn more about the latest knowledge.A.
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