Centralizing log messages to a syslog server can improve the manageability of any size network and can decrease response times to resolve problems. Sending router log messages to a remote server also allows longer archiving of messages than in a router’s limited storage. Messages stored by syslog have permanence that a router does not. When a router is reloaded or power cycled, the messages in its log are erased. This tech-recipe describes the configuration steps required to make a router send messages to a remote syslog server.
A router’s log can save your life. Well, at the least, it can save you time and headaches when troubleshooting problems. However, in the heat of battle, old messages in the log can get in the way. After making a change to the router’s configuration, for instance, it is easier to monitor only subsequent messages in the log. Clearing the log is simple.
Messages logged by a router can make troubleshooting problems substantially easier. However, the default size of most Cisco routers is 4096 bytes which typically accommodates fewer than 60 messages. While this may help in many situations, adding some additional space can save the day when a router generates frequent error messages as when an interface state cycles up and down. This tech-recipe describes the simple configuration to increase the size of the router log.
When replacing a faulty router that is not completely dead, it may be possible to copy the startup configuration to the removable flash memory and swap the flash to get the new router up and configured in as short a time as possible. Without this procedure, manually copying the old configuration to the new router will be necessary. This simple command also provides a local backup copy of the router’s config which can save hours of work when replacing a dead router.
Mini Cooper automobiles have the option to be fully configured to a geek’s liking. One feature they offer is the Mini Connected add-on. This lets you connect your smartphone via Bluetooth or USB to access the media and other features. In this tutorial, I will outline how to pair a Bluetooth phone to your Mini Connected system and also enable the Office feature.
In order to use Apache Maven for dependency resolution and automatic resolution of transitive dependencies for software projects on a Windows machine, it is necessary to set the proper Windows Environment Variables. This setup is necessary on all modern versions of Windows, and the steps to do so are also similar for all versions.
Understanding PHP’s numerous built-in functions for manipulating strings is essential if you ever want to be efficient with the language.
ZFS supports a type of RAID-5 redundancy called raidz. This redundancy works at the ZFS pool level and affects all created filesystems in that pool. According to the Sun docs, raidz offers “better distribution of parity [than RAID-5] and eliminates the ‘RAID-5 write hole’ (in which data and parity become inconsistent after a power loss).” Creating RAID volumes in most volume managers (like VeritasVM) requires learning a new language describing the various components involved. ZFS only requires one command.
Have you ever run out of disk space on your production server? Do you cringe at the downtime required to bring filesystems offline, backup, create bigger filesystems, and restore, all the while typing with crossed fingers? Do you dread deciding the disk layout for your new server? You do not need to panic! ZFS has you covered. In one simple command, you can add space to a ZFS pool without taking it offline.
Descendent (child) filesystems in ZFS take on the characteristics of the parent filesystem (compression, quotas, and available disk space). The pool concept in ZFS is fitting – a hard drive (or several) becomes a pool. We no longer have to define the exact size of a filesystem when we create it. Each filesystem has access to the same pool of space. However, it is simple to reserve a minimum amount of space for a filesystem and its decendents.
Creating new ZFS filesystems may seem strange at first since they are initially mounted under their parent filesystem. This is no problem since ZFS provides a simple and powerful mechanism for setting the mount point for a filesystem.
The distinction between ZFS pools and filesystems is worth repeating. A ZFS filesystem cannot exist outside of a ZFS pool. Creating a ZFS pool also creates a ZFS filesystem of the same name. Understanding the second part can help avoid confusion. This tech-recipe describes the simple step to list the ZFS filesystems configured on the system.
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