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LINUX: How To Display All Runtime Kernel Parameters In Linux? (sysctl command)

Below sysctl command can be used to display all runtime kernel parameters in Linux.

sysctl -a

Below is portion of "sysctl -a" command output for reference.

# sysctl -a
abi.vsyscall32 = 1
crypto.fips_enabled = 0
debug.exception-trace = 1
debug.kprobes-optimization = 1
dev.hpet.max-user-freq = 64
dev.mac_hid.mouse_button2_keycode = 97
dev.mac_hid.mouse_button3_keycode = 100
dev.mac_hid.mouse_button_emulation = 0

Products to which Article Applies

All Linux Operating Systems

Additional Reference

https://linux.die.net/man/8/sysctl

LINUX: "systemctl" Command to Check if Infiniband PCI Devices Are Loaded On Linux Hosts (How To Doc)

Below is "systemctl" command to run.

systemctl | egrep -i pci

Below is sample output of above command.

# systemctl | egrep -i pci
sys-devices-pci0000:00-0000:00:04.0-net-eth1288_2.318.device loaded active plugged   MT27500/MT27520 Family [ConnectX-3/ConnectX-3 Pro Virtual Function]
sys-devices-pci0000:00-0000:00:04.0-net-eth648_1.318.device   loaded active plugged   MT27500/MT27520 Family [ConnectX-3/ConnectX-3 Pro Virtual Function]
sys-devices-pci0000:00-0000:00:04.0-net-ib0.device            loaded active plugged   MT27500/MT27520 Family [ConnectX-3/ConnectX-3 Pro Virtual Function]
sys-devices-pci0000:00-0000:00:04.0-net-ib1.device            loaded active plugged   MT27500/MT27520 Family [ConnectX-3/ConnectX-3 Pro Virtual Function]

Products to which Article Applies

All Linux machines using Infiniband

LINUX: How To Find Failed Services and Modules on Linux Machine? (systemctl command)

Below "systemctl" command can be used to find the failed services and modules on Linux machine.

systemctl | grep -i fail

Below is sample output of above command which shows one failed service.

● systemd-binfmt.service loaded failed failed Set Up Additional Binary Formats

Products to which Article Applies

All Linux Operating Systems.

Additional Reference

https://www.digitalocean.com/community/tutorials/how-to-use-systemctl-to-manage-systemd-services-and-units

LINUX: How To Check Which Services Are Enabled on Linux Machine? ("systemctl" command)

Below "systemctl" Command can be used to check all the services enabled on Linux machine.

systemctl list-unit-files

Below is example snippet of above command.

UNIT FILE STATE

tmp.mount disabled
var-lib-nfs-rpc_pipefs.mount static
brandbot.path enabled
systemd-ask-password-console.path static
systemd-ask-password-wall.path static
session-2.scope static
acpid.service enabled

Products to which Article Applies

All Linux Operating Systems

Additional References

https://www.digitalocean.com/community/tutorials/how-to-use-systemctl-to-manage-systemd-services-and-units

LINUX: How To Enable Particular Service Using "systemctl" Command To Auto Start During Reboot?

Below "systemctl" Command can be used to enable particular Service.

systemctl enable <service name>

For example if you want to enable Docket service to start when Linux Machine reboots, your "systemctl" command will look as follows:

systemctl enable docker

Once the service is enable run below command to verify that the service is enabled.

systemctl list-unit-files | grep -i <service>

For e.g. if you enabled Docker service, you can run below command to verify whether the Docker service is enabled.

systemctl list-unit-files | grep -i docker.

Below is example output of above command.

# systemctl list-unit-files | grep -i docker
docker.service enabled

Products to which Article Applies

All Linux Operating Systems

Additional References

https://www.digitalocean.com/community/tutorials/how-to-use-systemctl-to-manage-systemd-services-and-units

LINUX: How to Enable Service On Linux Nodes Using Systemctl Command? (How To Doc)

On Linux 7 & above versions "chkconfig --list" command cannot be used for enabling the services.
We will have to use systemctl command to check and enable services on Linux 7 and above versions.

Follow below steps to enable the desired service on Linux OS using systemctl command.

1. Check the status of the service using below command.

systemctl list-unit-files | grep -i <service name>

Below is sample output which shows the status of docker as disabled.

# systemctl list-unit-files | grep -i docker

docker.service disabled

docker.socket disabled

2. Enable the desired service using below command.

systemctl enable docker

Below is sample snippet of enabling the docker service using systemctl command.

# systemctl enable docker

Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.

3. Check the status of the service using below command.

systemctl list-unit-files | grep -i <service name>

You will see that the service is enabled. Below is the sample output which shows docker service as being enabled.

# systemctl list-unit-files | grep -i docker

docker.service enabled

docker.socket disabled

Products to which Article Applies

All Host Operating Systems Using ILOM

Additional Reference

https://www.digitalocean.com/community/tutorials/how-to-use-systemctl-to-manage-systemd-services-and-units

LINUX: How To List All the Services and their State Using systemctl command? (How To Doc)

On Linux 7 & above versions "chkconfig --list" command does not list all th systemd services and their status.

We will have to use systemctl command to check the services and their status on Linux 7 and above versions.

Below command can be executed to list all the services and their status.

systemctl list-unit-files

Below is sample output.

UNIT FILE STATE

proc-sys-fs-binfmt_misc.automount masked

dev-hugepages.mount static

dev-mqueue.mount static

proc-fs-nfsd.mount static

proc-sys-fs-binfmt_misc.mount static

sys-fs-fuse-connections.mount static

sys-kernel-config.mount static

sys-kernel-debug.mount static

tmp.mount disabled

var-lib-nfs-rpc_pipefs.mount static

brandbot.path enabled

systemd-ask-password-console.path static

systemd-ask-password-wall.path static

session-2.scope static

acpid.service enabled

arp-ethers.service disabled

auth-rpcgss-module.service static

Products to which Article Applies

All Linux Operating Systems

Additional Reference

https://www.digitalocean.com/community/tutorials/how-to-use-systemctl-to-manage-systemd-services-and-units

LINUX: systemctl Command To Check Network Interfaces Loaded and Active on the Linux Machine (How To Doc)

Below "systemctl" command can be executed to check the network interfaces loaded and active on Linux Machine.

systemctl | egrep -i "net/devices"

Below is sample output of above command.

  sys-subsystem-net-devices-bond0.device                        loaded active plugged   /sys/subsystem/net/devices/bond0
  sys-subsystem-net-devices-bond1.device                        loaded active plugged   /sys/subsystem/net/devices/bond1
  sys-subsystem-net-devices-bond10.device                       loaded active plugged   /sys/subsystem/net/devices/bond10
  sys-subsystem-net-devices-bond2.device                        loaded active plugged   /sys/subsystem/net/devices/bond2

Products to which Article Applies

All Linux Operating Systems

Additional Reference

http://man7.org/linux/man-pages/man1/systemctl.1.html

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LINUX: How To Display All Runtime Kernel Parameters In Linux? (sysctl command)

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LINUX: "systemctl" Command to Check if Infiniband PCI Devices Are Loaded On Linux Hosts (How To Doc)

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LINUX: How To Find Failed Services and Modules on Linux Machine? (systemctl command)

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https://www.digitalocean.com/community/tutorials/how-to-use-systemctl-to-manage-systemd-services-and-units

LINUX: How To Check Which Services Are Enabled on Linux Machine? ("systemctl" command)

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LINUX: How To Enable Particular Service Using "systemctl" Command To Auto Start During Reboot?

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LINUX: How to Enable Service On Linux Nodes Using Systemctl Command? (How To Doc)

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LINUX: How To List All the Services and their State Using systemctl command? (How To Doc)

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LINUX: systemctl Command To Check Network Interfaces Loaded and Active on the Linux Machine (How To Doc)

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