Η εντολή write erase διαγράφει την παραμετροποίηση εκκίνησης (startup-config). Αν ακολουθήσει επανεκκίνηση της συσκευής, όλες οι ρυθμίσεις που έχουν γίνει χάνονται οριστικά.

Συνώνυμα: erase startup-config και erase nvram:.

With the noble efforts of the members of the Greek Fedora community, the Ask Fedora website now has a subsection for questions in Greek at ask.fedoraproject.org/el/questions/.

Check the status with:

cf status

Force a takeover with:

cf takeover -n

Match Neighbor IP

policy-options {
    policy-statement bgp-incoming {
        term from-customer-ACME {
            from neighbor 1.2.3.4;
            then reject;
        }
    }
}

Multiple Match Conditions

This policy will accept routes from a specific neighbor only if they are tagged with a specific community:

policy-options {
    policy-statement bgp-incoming {
        term from-customer-ACME-accept {
            from {
                neighbor 1.2.3.4;
                community A1com;
            }
            then {
                accept;
            }
        term from-customer-ACME-reject {
            from neighbor 1.2.3.4;
            then reject;
            }
        }
    }
}

• RegExr an online tool to help you build regular expressions.
• Regex Golf an online Regex Golf game to help you sharpen your regex-building skills.

In Zenoss, there is a chance that you might get a failure to set or change the IP of a device in the web interface. This sometimes happens because that specific IP address is already assigned to one of the subinterfaces (typically a Vlan interface) of another device. In this case, you will just get an error that Zenoss Failed to set IP Address.

If you try to set or change the IP address from ZenDMD, then the error is a little bit more informative:

>>> Device = find('web-server.zindilis.net')
>>> Device.setManageIp('1.2.3.4')
2014-01-15 11:18:30 WARNING zen.Device The IP address 1.2.3.4 is already assigned
'The IP address 1.2.3.4 is already assigned'

The problem here is that you can't find an IP by searching for it in the web interface, if that IP is assigned to a subinterface. Enter ZenDMD! Here's how to search of a specific IP, in all the interfaces of all the devices:

>>> for Device in dmd.Devices.getSubDevices_recursive():
...      for Interface in Device.os.interfaces(): 
...           if Interface.getIpAddress() != None and Interface.getIpAddress().startswith('1.2.3.4'):
...                print Device.id, Interface.id, Interface.getIpAddress()

Running the above, will return a result similar to:

router-1.zindilis.net Fa0/1.900 1.2.3.4

This tells you the device on which that IP address exists, and the specific subinterface on which it is assigned to.

These are my favorite MySQL backup and restore one-liners.

Backup

To back up a database named stuff:

time mysqldump -u root -p stuff | gzip > stuff.sql.gz

This pipes the clear text output from mysqldump directly into gzip, and prints the duration of the operation in the end.

Restore

To restore the stuff database:

time gunzip -c stuff.sql.gz | pv | mysql -u root -p stuff

This decompresses the dump back in clear text, and feeds it to mysql through pv, which adds the perk of an indication of progress.

Clients

• Candy, a JavaScript-based multi-user chat client

• Using boom!, an Apache benchmarking tool written in Python.
• Using boom, a rewrite of boom! in Go.
• Using siege.

Links

• linux-kvm.org
• KVM Cluster Tutorial

See also

• virsh