Monitoring network connections certainly can be frustrating, mainly because they can be established and then disappear within a matter of seconds. In this post, we will show you how to achieve a Zen-like approach to monitoring network connections on your servers using a command line–based tool called iftop. iftop is to networks what top is to CPUs. And, in the same way, ifconfig refers to configuring an interface, the friendly iftop stands for “interface top”. Iftop on Solaris 11, an open … [Read more...] about How to measure NIC Performance/Throughput in Solaris 11 using iftop
Solaris
How to Use the ‘truss’ Command for Program and Error Analysis in Solaris
Truss is a debugging tool which provides insight into how a program operates by printing out system service calls along with their arguments and return statuses, faults, and signals. As such it is extremely useful for debugging errors and for figuring out how programs work. Truss is easy to use: just prepend the word "truss" to any command (including arguments) in its simplest form, and output abounds. By default, truss output goes to stderr (error output), not to stdout (normal output). This … [Read more...] about How to Use the ‘truss’ Command for Program and Error Analysis in Solaris
Solaris : How to start syslogd in debug mode
The post outlines the steps to run the syslog daemon in debug mode. 1. Stop the syslogd daemon: # /etc/init.d/syslog stop ### Prior to Solaris 10 # svcadm disable svc:/system/system-log:default ### Solaris 10 and above 2. The environment variable SYSLOGD_DEBUG affects the amount of output from syslog in debug mode. The default value is 1, which provides the least amount of output. Setting this variable to 5 provides the most output. For … [Read more...] about Solaris : How to start syslogd in debug mode
How to configure rsyslog on Solaris 11.1 to send messages to a remote host using TCP
The system/rsyslog service is newly available in the Solaris 11.1 release. To send and receive messages over TCP, the rsyslog pkg must be installed on the sending Solaris system (the source system) and the receiving Solaris system (the remote loghost). The rsyslog package is not installed by default in Solaris 11.1 and later, and may need to be added. On both the source Solaris system and remote loghost system, check for the rsyslog package with: # pkg info system/rsyslog pkg: info: no … [Read more...] about How to configure rsyslog on Solaris 11.1 to send messages to a remote host using TCP
Solaris Volume Manager (SVM) : How to Use Mirrors to Roll Back System Changes
There are many circumstances where major changes are being made to the system, such as a patchset install or OS upgrade, when it would be nice to have the option to undo those changes and revert to a previous system state in case something goes wrong. With software volume management and a little preparation, it is possible to keep a temporary copy of the boot disk and roll back to it if needed. The boot disk needs to be mirrored. SVM root encapsulation and mirroring [SPARC] In the … [Read more...] about Solaris Volume Manager (SVM) : How to Use Mirrors to Roll Back System Changes
How to set boot-device with luxadm command in Solaris
This procedure demonstrates how to easily use the "luxadm" command to set the "boot-device" Open Boot Prom (OBP) parameter from a system booted from cdrom or in single user mode. The command will change the "boot-device" setting at the OS level and at the same time, change the "boot-device" setting at the OBP level. This procedure enables the "boot-device" to easily be changed for systems with storage devices whose device paths are not one of the built-in OBP boot aliases (disk, disk1, … [Read more...] about How to set boot-device with luxadm command in Solaris
How to create an OBP boot device alias in Solaris [SPARC]
These aliases are created to simplify access to hardware devices at the OBP level. They can be used in place of the full OBP hardware path at the "ok" prompt. When viewed via the "devalias" command at the prom level, they are listed in the form of the alias name followed by the full hardware path to the device. There are 3 methods discussed in this post to create a boot device alias. Method 1: Creating a custom boot device alias using show-disks and nvalias from the OpenBoot PROM (OBP) … [Read more...] about How to create an OBP boot device alias in Solaris [SPARC]
How to create or change or view Boot Device Aliases in Solaris Online
This is a procedure to see what the OpenBoot PROM (OBP) aliases are from a booted system, without having to down the system to the "ok" prompt. These aliases are both the "built-in" and any others that may have been manually created. They are the same aliases seen at the OBP level (at the "ok" prompt) with the "devalias" command. These aliases are created to simplify access to hardware devices at the OBP level. They can be used in place of the full OBP hardware path at the "ok" prompt. When … [Read more...] about How to create or change or view Boot Device Aliases in Solaris Online
Oracle Solaris 11 Zones : New Features
With Solaris 11, Oracle has introduced many new features. This is true with the Solaris zones as well. This post tries to list out the new features introduced in Solaris 11 zones. Oracle Solaris Zones is an OS virtualization feature in Oracle Solaris with a long and distinguished pedigree. One of the most highly adopted, highly used, mature virtualization technologies, Oracle Solaris Zones was first introduced as a core part of Oracle Solaris 10. In Oracle Solaris 11, Oracle Solaris Zones … [Read more...] about Oracle Solaris 11 Zones : New Features
Performing Network Diagnostics in Solaris 11 with “network-monitor”
network-monitor is a fault manager daemon (fmd) transport module utility. The network-monitor module: Monitors network resources Reports conditions that might lead to limited or degraded network functionality Generates an ireport on detecting an abnormal network condition Does not diagnose the error condition Does not perform any recovery actions You can use the fmdump command to retrieve ireports. Managing the network-monitor Module You can use the fmadm command to report the … [Read more...] about Performing Network Diagnostics in Solaris 11 with “network-monitor”