Typically, idle TCP connections are maintained indefinitely once established, even if no communication occurs between host systems. This is quite normal in TCP. In some cases, keeping the connection open may inappropriately consume host and/or application resources (normally TCP port ranges), if for example: the remote host crashes or otherwise undergoes some type of non-orderly shutdown and/or reboots without notifying it's TCP peer. the remote host is unreachable; the network path between … [Read more...] about How to Configure TCP Keepalive option in Solaris
Solaris
How to Configure iSCSI targets on Solaris 10
iSCSI target feature has been available since s10u7. Here is some information for setting up a basic iSCSI target configuration. High level steps to follow are as shown below : create a base directory configure the backing store Creating a target Add ACL to target 1. create a base directory The base directory is used to store the iSCSI target configuration data, and needs to be defined prior to using the iSCSI target for the first time. You can create a base directory with the … [Read more...] about How to Configure iSCSI targets on Solaris 10
Solaris Zone Install Fails With Cpio Error
The Problem Error when trying to install full root zone ERROR: cannot install zone: cannot access [/usr/bin/cpio] (exec failure) NOTE: Sparse root install was successful. The Solution 1. Check the permissions of the cpio executable on the problematic system first. # ls -al /usr/bin/cpio -rwxrwxrwx 1 root bin 85924 Sept 9 2018 /usr/bin/cpio Correct permissions should be: # ls -al /usr/bin/cpio -r-xr-xr-x 1 root bin 85856 Sept 9 2018 /usr/bin/cpio 2. Also many errors during … [Read more...] about Solaris Zone Install Fails With Cpio Error
How to measure NIC Performance/Throughput in Solaris 11 using iftop
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
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]