About using SSH to connect to the LIUNX server
Generate the key on the server side
ssh-keygen -t rsa
Add the public key to the server authorization file
id_rsa.pub >> authorized_keys
cat id_rsaCopy the private key to window, create a new text document and paste it. Use putty-gen to generate the private key *.ppk for putty
Connection -> when using PuTTY Connection; SSH -> Auth Click Browse to select the generated *.ppk and then click Open
yum install erlang
Download the RPM package
wget http://www.rabbitmq.com/releases/rabbitmq-server/v3.6.15/rabbitmq-server-3.6.15-1.el7.noarch.rpm
3. Install after downloading
yum install rabbitmq-server-3.6.15-1.el7.noarch.rpm
4. Restart the service after installation
service rabbitmq-server start
5. Check service status
service rabbitmq-server status
6. Install the plug-in
/sbin/rabbitmq-plugins enable rabbitmq_management
Restart the service
service rabbitmq-server restart
At this point, you can go to http://ip:15672 to access the page. The default password is “guest/guest”.
However, starting with version 3.3.0, access other than using guest/guest to log in to localhost is prohibited. The solution is to find
Rabbitmq_server-3.6.15 /ebin/ Rabbitmq_server-3.6.15 /ebin/ Rabbit.app
{loopback_users, [<<"guest">>]},
Is amended as:
{loopback_users, []},
Then restart it.
7. Access
when I use the following command:
$mount-t cifs //192.168.1.2/ Samba/MNT/Samba-o Username =test,password=test
mount samba share file gets the following error:
mount error 20 = Not a directory
Refer to the mount.cifs(8) manual page (e.g.man mount.cifs)
a Google search revealed that the problem could be due to the cifs file system not being compatible with older samba Shared servers, so either upgrading the samba server program or restricting the cifs would be required to fix the problem. According to the online advice, you can use:
$echo 0 > /proc/fs/cifs/LinuxExtensionsEnabled
modifies the cifs option to disable cifs extensions, and then mount is no problem.
but it was a bit cumbersome to do this every time I restarted, so I changed my system startup script so that I could put these mounts into my fstab and let the system mount automatically every time it was started. The methods are as follows:
modify /etc/init.d/netfs to add a line like the + sign in start as follows:
Case “$1” in the start)
+/sbin/modprobe cifs & amp; & echo 0 > /proc/fs/cifs/LinuxExtensionsEnabled
…
first execute “/sbin/modprobecifs” to load the cifs module, otherwise the file we want to modify LinuxExtensionsEnabled may not exist yet, and the modification will fail. Since rc*.d/S**netfs at different boot levels are linked to /etc/init.d/netfs, this change takes effect for all boot levels. Of course, if your system is not such a link, it is the same to modify the corresponding file.
there will be no problem installing the samba Shared file system after the restart.
It turns out that it still doesn’t work. It turns out that the security group of Aliyun also needs to match these ports (both entering and leaving should be matched) :
At this point, FTP is perfectly linked.
Node. js server mysql database connection timeout problem
Sometimes connection timeouts occur while the Node server is connecting to the database. This Error is Error: Connect ETIMEDOUT. The error position in the code is line 421 to 433 of mysql’s Connection.js file:
Connection.prototype._handleConnectTimeout = function() {
if (this._socket) {
this._socket.setTimeout(0);
this._socket.destroy();
}
var err = new Error('connect ETIMEDOUT');
err.errorno = 'ETIMEDOUT';
err.code = 'ETIMEDOUT';
err.syscall = 'connect';
this._handleNetworkError(err);
};This error is literally a connection timeout, and then my error is due to the database connection problem, when creating the database should carefully compare the parameters of the problem, like me:
when creating the database connection pool:
pool = mysql.createPool({
host: "127.0.0.1",
user: "user",
password: "",
database: "nodejs",
port: 3306,
});The header information in the database is:
Source Server : localhost
Source Server Version : 50624
Source Host : localhost:3306
Source Database : nodejs
Target Server Type : MYSQL
Target Server Version : 50624
File Encoding : 65001It can be seen that there is a problem with the connection address of the server, so the connection was successful after changing to localhost
Problem description
The run.sh script is executed to report an error with the following message:
/data/app/information-provider
: No such file or directory
: command not found
./run.sh: line 4: syntax error near unexpected token `newline'
'/run.sh: line 4: `case "$1" in Problem analysis
Look for the script. The script is fine, so I wonder if the file format is incorrect.
view the file with the following command,
cat -A run.shFind that in run.sh, the newline ends with ^M$
server="$( dirname "${BASH_SOURCE[0]}" )" && pwd ^M$
cd $server^M$
^M$
case "$1" in ^M$
^M$
...The solution
Execute the following statement to convert run.sh to a line break of $in the Linux environment
dos2unix run.shView the conversion file through Cat-a run.sh as:
server="$( dirname "${BASH_SOURCE[0]}" )" && pwd $
cd $server$
$
case "$1" in $
$Error:
system centos7.4 64-bit
python 2.7.5
plugins/python/uwsgi_python.h:2:20: fatal error: Python.h: No such file or directory
#include < Python.h>
Command “/usr/ bin/python2-u-c” import setuptools, tokenize;
Command “/usr/ bin/python2-u-c” import setuptools, tokenize; The file = ‘/ TMP/PIP – build – r2TLym uwsgi/setup. Py “; F = getattr (tokenize, open, open) (file); Code = f.r ead (). The replace (‘ \ r \ n ‘, ‘\ n’); f.close(); exec(compile(code, file, ‘exec’)) “install –record/TMP/pip-jwt5ox-record /install-record. TXT –single-version –compile” failed with error code 1 in/TMP/pip-build-r2tlym /uwsgi/
Check the solution:
yum install python-devel.x86_64
Then run the installation and fix the problem.
Error 1045(28000) Access Denied for user ‘root’@’localhost’
From http://zxy5241.spaces.live.com/blog/cns! 7682A3008CFA2BB0! 361.entry
When installing mysql database in Windows operating system, you encounter Error 1045(28000) Access Denied for user ‘root’@’localhost’, you need to reset the password.
the specific method is:
1. First, find my. Ini configuration file in the installation directory, open the configuration file, find the line [mysqld], add skip-gran-tables below and save the file, and restart mysql dynamic service.
2. Then execute mysql -u root mysql
mysql> update user set password=password(‘newpassword’) where user=’root’;
mysql> Flush privileges;
where newpassword is root’s newpassword. 3. Remove the line that added to my. Ini configuration file just now, and finally restart mysql.
After installing mysql or uninstalling the downloaded free version, the default is no my.ini file.
. However, there are several similar files, such as [code] my-small-ini, my-media.ini, my-large. Ini, my-huge. Ini, [/code].
these files are the different configuration information recommended by mysql for different applications; But these configurations will only be applied if you put them in my. Ini.
where:
1, my-small. Ini is designed for small database. This model should not be used for databases that contain common items.
2, my-media.ini is designed for medium-sized databases. If you are using RHEL in the enterprise, you will have significantly more physical memory than the minimum RAM requirements for this operating system (256MB). As you can see, if you have that much RAM memory available, you can naturally run other services on the same machine.
3, my-larg.ini is designed for use exclusively with a SQL database. Since it can use up to 512MB of memory for the database, at least 1GB of RAM will be required on this type of system so that it can handle both operating system and database applications.
4, my-huge. Ini is designed for databases in enterprises. Such a database would require a dedicated server and 1GB or more of RAM. These choices are highly dependent on the amount of memory, the speed of the computer, the size of the database details, the number of users accessing the database, and the number of users loading and accessing data into the database. The performance of the database may change as the number of databases and users increases.
according to their own situation, select a file configuration copy to my. Ini file, of course, you need to create your own, just create a new file, and then copy into the configuration information.