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Remote connection (Telnet/FTP/rsh/ssh) as root usage and summary
I. Introduction
Although we all think that telnet, FTP, and rsh are not safe services
In some cases, especially when security is not very important, some services such as FTP,
Because of its long history, it is still of great use in most cases. Many people use these services to log on directly as the root user.
This article briefly
Local console input SSH [email protected] Extranet IP or intranet IP, example: SSH [email protected] This is the user named root user login 192.168.133.196 This address is located in the background. If you are prompted with the following red partial error:@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ warning:remote HOST Identification has changed!
Typically, services are generally deployed in Linux or UNIX environments, and are typically based on command line non-view operations.Then connect this service machine to use the corresponding SSH connection tool,
In fact, the common development tools eclipse or IntelliJ idea have their own SSH connection tool, this t
One, System: CentOS 6.5 64-bitSecond, the method: Read/var/log/secure, find the keyword Failed, for example (note: The IP address in the article was deliberately omitted):Sep 09:08:09 localhost sshd[29087]: Failed password for root from 13.7.3.6 Port 44367 ssh2sep + 09:08:20 localhost ssh D[29087]: Failed password for root from 13.7.3.6 Port 44367 ssh2sep + 09:10:02 localhost sshd[29223]: Failed password fo
Solution to slow ssh connection in CentOS
Use commands
Ssh-vroot@10.10.90.204
To view the ssh debugging information, take the following steps:
Debug1: Next authentication method: gssapi-with-micDebug1: An invalid name was suppliedCannot determine realm for numeric host address
Solution:
1. Add the ip address and
Experiment:
1, test pc to 192.168.1.98:80, use browser to access 192.168.1.98:80 normal page
Ssh–f–n–l 0.0.0.0:2001:192.168.1.98:80 test@192.168.1.102
Ssh-n-l2001:remotehost:80 User@somemachine
This command opens the 2001 port on this machine, and the request to the native 2001 port passes through Somemachine as a springboard and goes to port 80 of remotehost.
The implementation effect is similar to t
VI/usr/ssh/sshd_config
Change maxstartup to the set upper limit.
Then restart the SSH service by/usr/init. d/sshd restart.
Modify timeout settings:
Two other common parameters of sshd_config:
Clientaliveinterval indicates how long it takes to send a message to the client to ensure that the connection is still in progress. The default value is 0, indicating that n
uploaded to founder's computer. The transfer system is also very time-consuming. According to the hard disk size, if the 30 GB hard disk, more than 100 computers will have to be transferred for more than two hours, which is faster than a single platform installation! However, if the system is complete and you forget to install a software package, or you still need to make some minor modifications. You can upload the package again, but it is too slow. It will take less than two or a half-day upl
1, vi/etc/security/limits.conf* Soft Nofile 65535* Hard Nofile 65535* Soft Nproc 65535* Hard Nproc 65535Reference example, normal modification (Redhat6.4)2, vi/etc/security/limits.d/90-nproc.conf* Hard Nproc 65535* Soft Nproc 65535* Hard Nproc 65535* Soft Nproc 65535Reference example, normal modification3, Vi/etc/ssh/sshd_configModified to: Uselogin=yes4. Service
implement it (python is so simple !).Using the above Code to complete the task is still time-consuming, because the program has to wait for automatic interaction to appear, in addition, ubuntu ssh connection is slow and requires a series of verification, in this way, the security of ssh is reflected. We need to improv
How to monitor windows using ssh-powershell in python
This example describes how to monitor windows using ssh-powershell in python. Share it with you for your reference. The specific analysis is as follows:
For server monitoring, whether it is writing scripts by yourself or
UseDNS yes is set in the sshd service. When the configured DNS server becomes inaccessible, it may take 10 to 30 seconds to connect to the server. Because UseDNS is used, the sshd server will reverse resolve the ip address connecting to the client, even in the LAN.
When the connection is fast at ordinary times and suddenly becomes abnormal and slow, it may be because the DNS configured on the sshd server is invalid. For
Many times we prefer to SSH to a Linux server directly at the terminal of our own computer, rather than using a tool area with a UI interface to connect to our servers. But in the terminal using SSH we need to enter the account number and password every time, this is also a worry, so we can easily build a linux/mac os running automatic SSH login remote server gad
functions, which is more practical. Based on the above code, I believe that the reader already knows how to implement it (python is so simple !).
Using the above Code to complete the task is still time-consuming, because the program has to wait for automatic interaction to appear, in addition, ubuntu ssh connection is slow and requires a series of verification,
Original linkMany people use simple SSH connection tool, sometimes need to copy files under SSH to local view more convenient, I give you a simple command of the SCP.SCP is a file copy with security, SSH-based login. Easy to operate, for example, to copy the current file to
to complete the task is still time-consuming, because the program has to wait for automatic interaction to appear, in addition, ubuntu ssh connection is slow and requires a series of verification, in this way, the security of ssh is reflected. We need to improve efficiency and complete it in the shortest time. Later, I found the paramiko module in
more practical. The code above believes that the reader already knows how to do it (Python is that simple!). )。
Use the above code to complete the task is still relatively time-consuming, because the program to wait for automatic interaction, and Ubuntu with SSH connection is relatively slow, to conduct a series of verification, so as to reflect the security of
the host to generate a pair of keys, the public key placed in the ~/.ssh/authorized_keys file, Copy the private key to the Windows Host Environment directory, ImportParamikoprivate_key= Paramiko. Rsakey.from_private_key_file ('Id_rsa31.txt')#to place the private key here#To create an SSH objectSSH =Paramiko. Sshclient ()#allow connections to hosts that are not in the Know_hosts fileSsh.set_missing_host_ke
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