aristosv's questions

I have a computer that always has issues restarting/shutting down. I've installed many Linux distributions on it, including Debian 9 and VMware Photon OS, and I always have the same issue.

When I restart, the machines does not actually restart, it rather stops at a message saying "watchdog watchdog0: watchdog did not stop!" and simply sits there, doing nothing.

I have tried changing GRUB_CMDLINE_LINUX="" to GRUB_CMDLINE_LINUX="reboot=bios" and GRUB_CMDLINE_LINUX="reboot=acpi"

I have also configured RuntimeWatchdogSec and ShutdownWatchdogSec to 0

I have also enabled and disabled acpi in the bios

I also tried systemctl reboot, shutdown -r now, init 6 and various other suggestions I found online.

But no luck. The behavior does not change, the computer does not restart, it just stays there showing watchdog watchdog0: watchdog did not stop!

I don't have the same issue on other computers, so my guess is that there's something wrong with the bios settings on this computer, I just can't figure out what. I've reset the bios to it's default settings, but again, no luck.

Any suggestions?

Coming from a VMware environment, my through process was that,

1. Multiple Docker machines (swarm), mount the same NFS data stores
2. A container (e.g. Maria dB) is deployed on the Docker swarm
3. If a node in the swarm fails, the service is still running on the other nodes

So I mounted /var/lib/docker/volumes on an NFS share, on multiple Docker machines and tried to create a swarm. But eventually I found out that if multiple Docker machines mount the same NFS data store, the Docker service can only be started on one of the nodes.

So I guess my question is, how to I create a swarm, with the same service running on multiple nodes, and the data is kept on an NFS share?

Of course there’s a good chance I haven’t yet completely understood the idea of how a Docker swarm works, and I’m looking at this from a wrong angle.

I am using this power-shell script to send emails. My problem is with the $body variable. I don't want to attach the log file in the email, I want the contents of the log file to be in the body of the email.

Write-Host "Setting Variables" -ForegroundColor Green
    $user    = "username"
    $pass    = Get-Content "$PSScriptRoot\pass.txt" | ConvertTo-SecureString
    $cred    = New-Object -Typename System.Management.Automation.PSCredential -argumentlist $user,$pass
    $from    = "[email protected]"
    $to      = "[email protected]"
    $subject = "Email Subject"
    $body    = Get-Content C:\backup\log.txt
    $smtp    = "smtp.gmail.com"

    Write-Host "Sending Email" -ForegroundColor Green
    Send-MailMessage -From $from -To $to -Subject $subject -Body $body -SmtpServer $smtp -Port 587 -UseSsl -Credential $cred

When I run the script I get a message saying:

Send-MailMessage : Cannot convert 'System.Object[]' to the type 
'System.String' required by parameter 'Body'. Specified method is not 
supported.

How can I read the contents of the log file and put it in the body of the email?

I have two servers, DHCP1 and DHCP2 running on Windows Server 2008 and I want to migrate them both on Windows Server 2012 without downtime to the DHCP service. After reading a few articles this is what I have so far.

1. Export all the DHCP configuration from the 2008 server using "netsh dhcp server export C:\Users\user\Desktop\dhcp.txt all"
2. Import all the DHCP configuration on the 2012 server using "netsh dhcp server import C:\Users\user\Desktop\dhcp.txt all"
3. Authorize the new DHCP server from the DHCP console.

My problem is that I have to maintain the same hostnames and IP Addresses for the 2012 servers. So I’ll have to bring down one of the 2008 servers, replace it with a 2012 server and import all the configuration I exported from the 2008 server. And then repeat for the second 2008 DHCP server.

1. Will I have to de-authorize the first 2008 server before shutting it down and replacing it with a 2012 server?
2. Will the second 2008 server work properly when the first 2008 server is replaced with a 2012 server?
3. Anyone who’s done this before, do you have any advice, tips & tricks or anything I should be on the lookout for?

I realize this should be a simple task, but I’ve never done it before and I’d like some advice from someone with more experience.

I have an OpenNMS system configured and up and running.

I have a few Linux (debian) servers and I need to monitor if a specific service is running on them. This must be done using only ssh access. No SNMP or agents. I must configure OpenNMS to log-in on these servers and check if this service is running.

I've read about Polling, but I haven't found instructions on how to configure OpenNMS to access a remote Linux computer and check if a service is running.

Ideally what I'm looking for is a way to specify in OpenNMS, an IP Address, username, password and the name of the process I want to monitor.

How can I do this?

I have the following scripts running on raspbian.

start

#!/bin/bash
/root/config/commands 2>&1 > /root/log/$HOSTNAME.log

commands

#!/bin/bash
source /root/config/variables
echo TestLine
/usr/bin/lftp ftp://user:[email protected] -e "set ftp:ssl-allow no ; set net:reconnect-interval-base 5 ; set net:max-retries 2 ; mirror -e /testgroup/music /root/media ; quit"
/usr/bin/mail -s "$HOSTNAME Report" $emailaddress < $logdir/$HOSTNAME.log``

When I run "start" manually I receive the email below

TestLine
Total: 1 directory, 4 files, 0 symlinks

When I run it using cron, I get the following email

TestLine

This is how crontab -e is set up

@daily /root/start

Any idea why would cron strip the lftp output from the email?

I've configured multiple IP Addresses on my Ubuntu ssh server. Now the server can be accessed by using any IP Address, from 192.168.0.51 to 192.168.0.99.

Depending on which IP Address someone uses to access this server, I want the request to be forwarded, to localhost, on a specific port. For example:

If I ssh on IP address 192.168.0.51 the ssh server should forward my request to localhost:5001

If I ssh on IP address 192.168.0.52 the ssh server should forward my request to localhost:5002

If I ssh on IP address 192.168.0.53 the ssh server should forward my request to localhost:5003

In essence this will actually forward the session to another host which is connected on this ssh server using reverse nat.