Kernel dropped packet analysis

Found a simple method to check for all the packets dropped by kernel.

First you need to install dropwatch with

dnf install dropwatch

and details of the package

Name        : dropwatch

Arch        : x86_64

Epoch       : 0

Version     : 1.4

Release     : 13.fc24

Size        : 27 k

Repo        : fedora

Summary     : Kernel dropped packet monitor

URL         : http://fedorahosted.org/dropwatch

License     : GPLv2+

Description : dropwatch is an utility to interface to the kernel to monitor for dropped

network packets.

journalctl command to see kernel messages

Sometimes, there are just too many messages in journalctl output and it becomes a mystery game to search for the messages you are looking for. But luckily you do not need to use grep to find the right message. Here is example of what I had to do when I was looking for kernel messages.

journalctl _TRANSPORT=kernel
# To see all the fields, you can use the verbose mode
journalctl _TRANSPORT=kernel -o verbose

# And the filter on priority if needed to get the messages you need
journalctl _TRANSPORT=kernel PRIORITY=4

# and follow
journalctl _TRANSPORT=kernel PRIORITY=4 -f -l

ansible with docker dynamic inventory

So, I have a few dockers. Every now and then I want to run some command on all of them. Doing ‘docker exec’ is tiresome. I found this neat solution with ansible that I thought I should share with you.

To get started, you need to have the “docker.py” script. This script will be used as python script inventory for ansible. So, use the following command and get the script:

power saving on laptop

One of the easiest way to make sure that you can have a decent battery life is

sudo yum install tlp smartmontools
sudo systemctl enable tlp
sudo systemctl start tlp

And after this you can check the status like this:

sudo tlp stat
— TLP 0.9 ——————————————–

+++ Configured Settings: /etc/default/tlp
TLP_ENABLE=1
TLP_DEFAULT_MODE=AC
DISK_IDLE_SECS_ON_AC=0
DISK_IDLE_SECS_ON_BAT=2
MAX_LOST_WORK_SECS_ON_AC=15
MAX_LOST_WORK_SECS_ON_BAT=60
SCHED_POWERSAVE_ON_AC=0
SCHED_POWERSAVE_ON_BAT=1
NMI_WATCHDOG=0
ENERGY_PERF_POLICY_ON_AC=performance
ENERGY_PERF_POLICY_ON_BAT=powersave
DISK_DEVICES=”sda sdb”
DISK_APM_LEVEL_ON_AC=”254 254″
DISK_APM_LEVEL_ON_BAT=”128 128″
SATA_LINKPWR_ON_AC=max_performance
SATA_LINKPWR_ON_BAT=min_power
AHCI_RUNTIME_PM_TIMEOUT=15
PCIE_ASPM_ON_AC=performance
PCIE_ASPM_ON_BAT=powersave
RADEON_POWER_PROFILE_ON_AC=high
RADEON_POWER_PROFILE_ON_BAT=low
RADEON_DPM_STATE_ON_AC=performance
RADEON_DPM_STATE_ON_BAT=battery
RADEON_DPM_PERF_LEVEL_ON_AC=auto
RADEON_DPM_PERF_LEVEL_ON_BAT=auto
WIFI_PWR_ON_AC=off
WIFI_PWR_ON_BAT=on
WOL_DISABLE=Y
SOUND_POWER_SAVE_ON_AC=0
SOUND_POWER_SAVE_ON_BAT=1
SOUND_POWER_SAVE_CONTROLLER=Y
BAY_POWEROFF_ON_BAT=0
BAY_DEVICE=”sr0″
RUNTIME_PM_ON_AC=on
RUNTIME_PM_ON_BAT=auto
RUNTIME_PM_ALL=1
RUNTIME_PM_DRIVER_BLACKLIST=”radeon nouveau”
USB_AUTOSUSPEND=1
USB_BLACKLIST_WWAN=1
RESTORE_DEVICE_STATE_ON_STARTUP=0

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enki editor – amazing for md and rst files

First, you need to install enki. YOu can do so with

sudo yum install enki

And then you can use the editor as usual. The first thing that you will notice is the navigator window. And here is screenshot for you.

As you can see if you make a typo or mistake then you will immediately be warned with RED color.

xsos – a tool for sysadmins and support

Here is a very nice article that you may find useful

https://access.redhat.com/discussions/469323

sysreporter on Fedora – basic system report in email

From the packages github page:

{#user-content-sysreporter.anchor}SysReporter

SysReporter (System Reporter) is a bash script that runs and aggregates a set of reports about its host system. The report can then be emailed to the system administrator on a daily, hourly, minutely basis.

and from dnf info

Name        : sysreporter
Arch        : noarch
Epoch       : 0
Version     : 3.0.4
Release     : 1.fc24
Size        : 17 k
Repo        : @System
From repo   : updates
Summary     : Basic system reporter with emailing
URL         : https://github.com/onesimus-systems/sysreporter
License     : MIT
Description : Basic system reporter with emailing

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