1.Linux hard links and soft connectionsln command, create a connection command parameters: Necessary parameters:-B Delete, overwrite previously established link-D allows super users to make hard links to directories-F Force Execution-I interactive mode, file presence prompts the user whether to overwrite-S soft link (symbolic link)-V displays detailed process
, and the link file and the original file are actually the same file. Can be viewed through ls-i, the inode number of these two files is the same, indicating that they are the same file, and the soft link is established a point, that is, the content of the linked file is a pointer to the original file, they are two files.Soft links can cross the file system, hard links can not, soft links can be a nonexiste
Use of soft links(1) Soft links can be cross-partitioned, you can also create soft links to the directory(2) When a partition is not sufficient, you can create a soft link under the partition that is linked to a large partition, whichTo avoid full disk writes(3) Sometimes a file is used multiple times, and must be in multiple directories, we can create a soft link to the fileThe soft connection is equivalen
Click to read the original1.Linux Link ConceptThere are two types of Linux links, one called hard links, and the other called Symbolic links (symbolic link). By default, the LN command produces a hard link."Hard Connect"A hard connection is a connection that is made through an index node. In a Linux file system, a file
Tp-link routers cannot connect to the Internet a workaround
Tp-link wireless router, model "tl-wr841n", can be used yesterday, whether it is wireless or local connection. Today is suddenly unavailable, wireless and local are dead, the display cannot connect to the Internet. Reset key pressed over, reboot, and even res
Review again, not much of the operation. Although the feeling will!!!This time again to operate again!!The above test found that after removing F1, the soft connection F3 was invalid, and the Hard link F3 was not affected.Ls-f can see the type of file.--------------------------------------------------------------------------------------------------------------- -1.Linux Link ConceptThere are two types of Li
Label:Http://f.dataguru.cn/thread-128013-1-1.html
The oracle11g password is case-sensitive by default, and the attribute is Sec_case_sensitive_logon controlled by the initialization parameter, which by default true indicates case sensitivity. However, prior versions of oracle11g are case-insensitive, so you may encounter the following issues when you create a database link in a previous version of oracle10g, such as oracle11g:10g> CREATE
Tp link 802.11n wireless network security connected to the encrypted network through TP-LINK management tools:
Step 1: TP-LINK management tool main program in the supporting Nic drive disc, we can run the installation wizard.
Step 2: Select "Install client utility and driver" in the installation type, and click "Next" to continue.
Step 3 connecting to the encry
Label:When using Docker we often encounter an application where I need two or more containers, some of which require services from other containers. For example, we need a container to provide the MySQL database service, while the other two containers are used as clients to connect to the MySQL database service. Let's take a look at how Docker is doing this with link. 1. Here we first create two container
I 'd like to introduce you to D-Link wireless router settings. Many people may not know about D-Link wireless router settings. It doesn't matter. After reading this article, you will certainly have a lot of GAINS, I hope this article will teach you more things.
Connect to a wireless router
1. The order of connecting to a wireless router is as follows:
Internet (a
>_It was okay last night. I couldn't debug it this morning. When I downloaded the program, I always reported that J-link could not be connected, and the stm32 seemed to have crashed. The LED lights did not flash, and the tftscreen was not displayed. >_ I thought it was a problem with the J-Link driver, but after I re-installed the driver and restarted the computer, it still didn't work ~ At last, someone o
)(Sid_name = MSSQL)(Program = tg4msql)))******************************
4. Configure tnsnames. ora in the Network \ ADMIN directory of the Oracle main directory. In my example:******************************MSSQL =(Description =(Address = (Protocol = TCP) (host = 192.168.1.180) (Port = 1521 ))(CONNECT_DATA = (SID = MSSQL ))(HS = MSSQL))******************************
5. Restart listener.
6. Use sqlplus to establish and test the database link. In the
mysql_port_3306_tcp_addr=172.17.0.2 mysql_port=tcp://172.17.0.2:3306 _=/usr/bin/env As you can see, the environment variables of the MARIADB container have been introduced directly under the Py-http container. and view hosts: # cat/etc/hosts 127.0.0.1 localhost::1 localhost ip6-localhost ip6-loopback Fe00::0 ip6-localnet FF00::0 Ip6-mcastprefix FF02::1 Ip6-allnodes FF02::2 ip6-allrouters 172.17.0.2 MySQL 48bd5fbf3ddc mariadb 172.17.0.3 db7f7aba7c2f You can see the host with the MySQL variable
inode number is also the same as a, so create n files will have n+2 link number.3. The link file and the original file have different inode numbers4. Deleting a linked file does not affect the source file, but if the linked file is programmed red after deleting the source file, create a file that matches the original file name directly in the source file directory.5, Soft
This is a creation in
Article, where the information may have evolved or changed.
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1, connect two Docker
First, you need to build the environment:Create the MARIADB database below Alpine:http://blog.csdn.net/freewebsys/article/details/53540615User name pass
! =NULL) {Pdataset=NewCadorecordset; Pdataset-setadoconnection (Pconn); }
if(pdataset->IsOpen ()) {Pdataset-Close (); } CString strSQL="Select GETDATE ()"; BRet=pdataset->openrecordset (strSQL)! =adores_failed; Use this to test if the database connection is broken.Catch(...) {
//DT ("Cmakesuresql test data connection is abnormal!");bret=FALSE;
} safe_delete (Pdataset); returnBRet;} BOOL cmakesuresql::retset (cadoconnection* pconn,cstring strconn) {
if (Pconn!=null) {pc
connect a cluster with Eclipse view file information hint 9000port error denying connection cannot connect to the Map/reduce location:hadoop1.0.3Call to ubuntu/192.168.1.111:9000 failed on connection exception:java.net.ConnectException: deny connection1. Common Solution: The configuration is very normal, is not connected. Once again, Hadoop location was configured to change the host in Map/reduce Master and
reasons can be solved. It's pretty specific.http://lingqi1818.iteye.com/blog/1317433But assuming that these things are not linked, it means that some ports on the server are not open and cannot be connected.Workaround to first configure the IP table to open some ports, and then restart server.Root enters serverVi/etc/sysconfig/iptablesJoin-A input-m state--state new-m tcp-p TCP--dport 10002-j ACCEPT (the port opened here is 10002)Save exitService Iptables RestartTry the code again, get it done!
Oracle database link connects to different database platforms in mssql, which is generally called a heterogeneous database service. Different vendors have different implementation technologies: in SQL SERVER, it is called a LINKED SERVER, use ODBC to interconnect with other databases. The technology for implementing heterogeneous services in ORACLE is called Transparent Gateway ). Currently, ORACLE uses transparent gateways to
=staticipaddr=192.168. 80.129 NETMASK=255.255. 255.0 GATEWAY=192.168. 80.2Where ipaddr is set according to its own needs. My this setting of the virtual machine private network IP is 80 network segment, here, my ipaddr set is 192.168.80.129,gateway set is 192.168.80.2After Setup is complete, save to exit.Enter Ifconfig again at this point and you can see the IP address.5. Turn off the Linux firewallService Iptables Stopchkconfig iptables off6. Start the SSH serviceService sshd StartIf startup is
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