XK0-005 · Question #359
As part of the requirements for installing a new application, the swappiness parameter needs to be changed to 0. This change needs to persist across reboots and be applied immediately. A Linux…
The correct answer is A. echo "vm.swappiness=0" >> /etc/sysctl.conf && sysctl -p. To make a kernel parameter change both persistent and immediate, two steps are required. Writing vm.swappiness=0 to /etc/sysctl.conf ensures the setting survives reboots. Running sysctl -p reloads /etc/sysctl.conf and applies all settings immediately without a reboot…
Question
As part of the requirements for installing a new application, the swappiness parameter needs to be changed to 0. This change needs to persist across reboots and be applied immediately. A Linux systems administrator is performing this change. Which of the following steps should the administrator complete to accomplish this task?
Options
- Aecho "vm.swappiness=0" >> /etc/sysctl.conf && sysctl -p
- Becho "vm.swappiness=0" >> /proc/meminfo && sysctl -a
- Csysctl -v >> /proc/meminfo && echo "vm.swapiness=0"
- Dsysctl -h "vm.swapiness=0" && echo /etc/vmswapiness
How the community answered
(24 responses)- A71% (17)
- B17% (4)
- C8% (2)
- D4% (1)
Explanation
To make a kernel parameter change both persistent and immediate, two steps are required. Writing vm.swappiness=0 to /etc/sysctl.conf ensures the setting survives reboots. Running sysctl -p reloads /etc/sysctl.conf and applies all settings immediately without a reboot. /proc/meminfo is a read-only virtual file providing memory statistics and cannot be written to for configuration. Options C and D contain the misspelled parameter swapiness (missing a 'p'), which would not work correctly.
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