Linux Networking

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The variety of Linux distributions creates myriad issues relating to configuration and operations when computers are networked, not the least of which is the use of various network management applications, some of which are included with specific distributions, while others are standalone applications.

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Hello,

I would like to add additional node to existing cluster. I have installed  pcs,  pacemaker and fencing agent on the new node.

How do I add it into the cluster?  Can someone provide the steps?
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does 755, 777(user, group, everyone) vary from file say xyz.txt and directory say abc?
or same concept for both file and directory
if 755 means give whoever accessing(like users like me or John or Mike  etc) file  (xyz.txt)/directory(abc) partial access ?

if 777 means give whoever accessing(like users like me or John or Mike  etc) file  (xyz.txt)/directory(abc) complete access ?
please advise
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Hi Expert

I getting a situation here I having issue to login to the Web portal of the Ubuntu box . After communicating to the vendor it need to ssh to box to reset the password Please note is a Ubuntu box.

Question how to reset the password in the Ubuntu box ?
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We have a vendor who has put his linux based appliance behind a firewall. If I ssh to the system from the same subnet as the linux appliance ssh succeed - giving me a login prompt and then succeeding with authentication. If I login to the linux appliance from the Outside of the firewall the conversation succeeds apparently - I get a login prompt. But when I enter the same credentials the connection is promptly terminated. If I look at the firewall I see only the allowed SSH session and no other denies to the server.
Any idea what might be going on? What logging could be looked at on the linux appliance to give us insight as to why the ssh connection is failing in the second case? Thank you
0
winscp how to save shared bookmarks shortcut

i was referring below but no complete info

https://savethehealthy.com/shortcuts-for-winscp-keyboard-shortcuts.html
0
like a full clone in VMWARE , is there a way to do this?


thanks
0
I have identical configs for the east and west coast , I have launched 30 or so of centos images , PPK,PEMs all in place all was working .

I added Centos AMI's to the US_WEST and cannot SSH into them"connection Refused" now I go back to the US-EAST and cannot SSH into them at all , all ports are open the security settings are all the same .


is there a limit to how many instances we can ssh into or something I am baffled about this ?

please help this is a production type issue ( giving a class )


how can I get more logs on the "connection refused" error


thanks
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hi,

I connnected to one production inace went to the log directory where bunch of log files there.

how to continuosly monitor logs for any possible errors , exceptions.

how frequently new files created?
do i have to do vi command to open the log file

please advise
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i,

i am going through below link

https://www.petefreitag.com/item/426.cfm
when to use fgrep and when to use grep ?
are there any advantages, disadvantages on over other?
please advise
0
Hello,

We have a program that needs to bind with port 44440, but when we try to use it says port is not available, but no other processes are using.   Does Linux restrict anywhere ?
0
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our lab recently has a new Ubuntu (14.04.1) machine but many of software package is out of date.
I try to update it before upgrade to Ubuntu 16.04. However, there is always problems for the command "sudo apt-get update"

I have googled this problem and change "/etc/apt/sources.list" several times, but the error still exists´╝Ä
I am thinking the error may come from => Could not resolve 'hcapxb01'
I have no idea about the 'hcapxb01'.  My machine has internet connection but I can't ping or nslookup the  'hcapxb01'

Experts, please help me to slove "sudo apt-get update" error. Thank you
Snap1.png
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Sysadmin is complaining that when traffic to his server is a little higher than usual (say 300Mbps on a 1Gbps interface) that he's seeing Rx errors on his interface. If I look at the switch that is connected to his server it shows everything clean. No errors Rx/Tx - just an increase in throughput once a day. It's a linux system. What can I advise him to do regarding errors on higher than average throughput? Anything else I could do on the Cisco switch side?
0
what is difference between

wc vs wc -l vs wc -c vs wc -lw


when we say
wc -lw
is it same as
wc -l -w

what is the use of - in any command?
0
hi,

what is difference between
sort vs sort -n  vs sort -M vs sort -rM

please advise
0
Hi,

what is 2> command used for

please advise
what is 2 what is >
0
what is difference betweem

kill PID
versus
kill -9 PID

what is -9 here?
please advise
0
what is difference between below comand

ps
versus
 ps -e
 versuss
 ps -ef
 versuss
 ps -ef|grep xyz

please advise
0
hi,
to learn unix and its command what are best online site, learning videos, training sites that are free available out there including some books.
please advise
0
hi,
what is diference between
Egrep vs grep s zgrep

what are other types of greps there

please advise
0
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hi,

i was watching below video
https://www.youtube.com/watch?v=goYjxpnTzFY&list=PL28YtFoet8RUsHxrIsQTkd82vIIZiiSmK&index=4
Instructor seems practicing unix commands on windows machine
how to get similar environmet so that i can practice on my local windows laptop at home?
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Hi,
how to uninstall mputty or tabbled putty running on my windows machine . please advise

i like to resinstall as initially only it is asking whether to map to your putty or not asking putty path?
how to find putty path to give that path so that it takes all putty sessions automaticaly?
please advise
0
Hi,

While checking the putty logs i see all same color without much indentation

how to make different color for Errors and Exception for colors
how to achieve identation
please advise
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hi,

i have log directory with say 40 log files in it

i have to search on "NullPoinerException" on above files and find out which file has this exception and which line

how do i grep this?

can i do these kinds of things on winscp etc some gui tools rather than putty?
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hi,

In below grep command

grep -C20 command "session" fileName


what is meaning of -  and C and 20.
 please advise
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hi,

I am trying to grep below

grep "SendLoginEvent" crm-CRMJava7-Staging-crm_st5_1.log.20171013*

but when i typed below i pasted something here like xyzzzzz

grep "SendLoginEvent xyzzzzz
xyzzzzz
xyzzzzz
xyzzzzz


>
>
>




now i cannot exit from this grep
i tried control Z not use
i tried esc no use

how to exit out

please advise
0

Linux Networking

17K

Solutions

14K

Contributors

The variety of Linux distributions creates myriad issues relating to configuration and operations when computers are networked, not the least of which is the use of various network management applications, some of which are included with specific distributions, while others are standalone applications.