system-config-kdump
at a shell prompt. You will be presented with a window as shown in Figure 22.1, “Basic Settings”.
kdump
as well as to enable or disable starting the service at boot time. When you are done, click to save the changes. The system reboot will be requested, and unless you are already authenticated, you will be prompted to enter the superuser password.
Make sure the system has enough memory
kdump
crash recovery is enabled, the minimum memory requirements increase by the amount of memory reserved for it. This value is determined by the user, and defaults to 128 MB plus 64 MB for each TB of physical memory (that is, a total of 192 MB for a system with 1 TB of physical memory).
kdump
daemon at boot time, click the button on the toolbar. This will enable the service and start it for the current session. Similarly, clicking the button will disable it and stop the service immediately.
kdump
kernel. To do so, select the Manual kdump memory settings radio button, and click the up and down arrow buttons next to the New kdump Memory field to increase or decrease the value. Notice that the Usable Memory field changes accordingly showing you the remaining memory that will be available to the system.
vmcore
dump. It can be either stored as a file in a local file system, written directly to a device, or sent over a network using the NFS (Network File System) or SSH (Secure Shell) protocol.
Table 22.1. Supported kdump targets
Type | Supported Targets | Unsupported Targets |
---|---|---|
Raw device | All locally attached raw disks and partitions. | — |
Local file system | ext2 , ext3 , ext4 , minix file systems on directly attached disk drives, hardware RAID logical drives, LVM devices, and mdraid arrays. | The eCryptfs file system. |
Remote directory | Remote directories accessed using the NFS or SSH protocol over IPv4 . | Remote directories on the rootfs file system accessed using the NFS protocol. |
Remote directories accessed using the iSCSI protocol over hardware initiators. | Remote directories accessed using the iSCSI protocol over software initiators. | |
— | Remote directories accessed over IPv6 . | |
Remote directories accessed using the SMB /CIFS protocol. | ||
Remote directories accessed using the FCoE (Fibre Channel over Ethernet) protocol. | ||
Remote directories accessed using wireless network interfaces. | ||
Multipath-based storages. |
vmcore
dump.
kdump
fails to create a core dump, select an appropriate option from the Default action pulldown list. Available options are (the default action), (to reboot the system), (to present a user with an interactive shell prompt), (to halt the system), and (to power the system off).
makedumpfile
core collector, edit the Core collector text field; see Section 22.2.3.3, “Configuring the Core Collector” for more information.