Category: Linux

monit is a program used to monitor processes and restart them if they failed. If your server don’t have monit installed, see install instructions at Install Monit on Ubuntu or Install Monit on CentOS

To restart elasticsearch on failure, create a file

vi /etc/monit/conf-enabled/elasticsearch.conf 

Add the following content to the file

check process elasticsearch with pidfile "/var/run/elasticsearch/elasticsearch.pid"
   start program = "/bin/systemctl start elasticsearch"
   stop  program = "/bin/systemctl stop elasticsearch"

Reload monit with

monit reload

To check the status of monit, run

monit status

Example

root@sok:~# monit status
Monit 5.26.0 uptime: 8m

Process 'elasticsearch'
  status                       OK
  monitoring status            Monitored
  monitoring mode              active
  on reboot                    start
  pid                          366866
  parent pid                   1
  uid                          115
  effective uid                115
  gid                          118
  uptime                       6m
  threads                      60
  children                     1
  cpu                          -
  cpu total                    -
  memory                       58.0% [2.2 GB]
  memory total                 58.2% [2.2 GB]
  security attribute           unconfined
  disk read                    0 B/s [97.5 MB total]
  disk write                   0 B/s [2.3 MB total]
  data collected               Mon, 09 Aug 2021 10:07:22

System 'sok.guest'
  status                       OK
  monitoring status            Monitored
  monitoring mode              active
  on reboot                    start
  load average                 [0.02] [0.18] [0.47]
  cpu                          4.4%us 1.4%sy 0.1%wa
  memory usage                 3.1 GB [81.7%]
  swap usage                   774.5 MB [18.9%]
  uptime                       3d 22h 39m
  boot time                    Thu, 05 Aug 2021 11:28:16
  data collected               Mon, 09 Aug 2021 10:07:22

root@sok:~# 

To see other ways of restarting ElasticSearch, see How to auto restart ElasticSearh service on failure

Back to monit

To find CPU Temperature, run command sensors

sensors

Example

boby@sok-01:~$ sensors
k10temp-pci-00c3
Adapter: PCI adapter
Vcore:       925.00 mV 
Vsoc:          1.06 V  
Tctl:         +36.2°C  
Tdie:         +36.2°C  
Icore:         4.00 A  
Isoc:          1.75 A  

boby@sok-01:~$ 

To find the temperature of NVIDIA graphics card, run

/usr/bin/nvidia-smi -q -d temperature

Example

boby@sok-01:~$ /usr/bin/nvidia-smi -q -d temperature

==============NVSMI LOG==============

Timestamp                                 : Mon Aug  2 23:53:27 2021
Driver Version                            : 460.91.03
CUDA Version                              : 11.2

Attached GPUs                             : 1
GPU 00000000:01:00.0
    Temperature
        GPU Current Temp                  : 45 C
        GPU Shutdown Temp                 : 97 C
        GPU Slowdown Temp                 : 94 C
        GPU Max Operating Temp            : 92 C
        GPU Target Temperature            : 83 C
        Memory Current Temp               : N/A
        Memory Max Operating Temp         : N/A

boby@sok-01:~$ 

sensors command shows data from various sensors on your computer like CPU temperature, voltage, etc…

To install lm-sensors package, run

apt install lm-sensors

To see sensor data, run the command “sensors”.

boby@sok-01:~$ sensors
k10temp-pci-00c3
Adapter: PCI adapter
Vcore:       844.00 mV 
Vsoc:          1.06 V  
Tctl:         +39.0°C  
Tdie:         +39.0°C  
Icore:         5.00 A  
Isoc:          1.50 A  

boby@sok-01:~$ 

To properly configure sensors, you need to run

sudo sensors-detect

This only needs to run one time to detect your hardware configuration. It will ask many questions, press enter to use default values.

ss is a tool to investigate sockets. It is similar to netstat, but shows more information. To see list of all open ports, run

ss -tlnp

Example

boby@sok-01:~$ sudo ss -lntp
State   Recv-Q  Send-Q    Local Address:Port     Peer Address:Port  Process                                                                                                                                
LISTEN  0       128           127.0.0.1:7878          0.0.0.0:*      users:(("ssh",pid=2401,fd=5))                                                                                                         
LISTEN  0       80            127.0.0.1:3306          0.0.0.0:*      users:(("mysqld",pid=1135,fd=19))                                                                                                     
LISTEN  0       4096            0.0.0.0:111           0.0.0.0:*      users:(("rpcbind",pid=880,fd=4),("systemd",pid=1,fd=34))                                                                              
LISTEN  0       511             0.0.0.0:80            0.0.0.0:*      users:(("nginx",pid=1147,fd=10),("nginx",pid=1146,fd=10),("nginx",pid=1145,fd=10),("nginx",pid=1144,fd=10),("nginx",pid=1143,fd=10))  
LISTEN  0       32        192.168.122.1:53            0.0.0.0:*      users:(("dnsmasq",pid=1528,fd=6))                                                                                                     
LISTEN  0       4096      127.0.0.53%lo:53            0.0.0.0:*      users:(("systemd-resolve",pid=883,fd=13))                                                                                             
LISTEN  0       5             127.0.0.1:631           0.0.0.0:*      users:(("cupsd",pid=929,fd=7))                                                                                                        
LISTEN  0       511           127.0.0.2:443           0.0.0.0:*      users:(("nginx",pid=1147,fd=11),("nginx",pid=1146,fd=11),("nginx",pid=1145,fd=11),("nginx",pid=1144,fd=11),("nginx",pid=1143,fd=11))  
LISTEN  0       1               0.0.0.0:7070          0.0.0.0:*      users:(("anydesk",pid=1054,fd=32))                                                                                                    
LISTEN  0       128               [::1]:7878             [::]:*      users:(("ssh",pid=2401,fd=4))                                                                                                         
LISTEN  0       4096               [::]:111              [::]:*      users:(("rpcbind",pid=880,fd=6),("systemd",pid=1,fd=36))                                                                              
LISTEN  0       5                 [::1]:631              [::]:*      users:(("cupsd",pid=929,fd=6))                                                                                                        
boby@sok-01:~$ 

See netstat

Audacity Import Filter Curve in Ubuntu

The import feature in Audacity Filter Curve Plugin is disabled on Ubuntu. Save feature worked. So what I did was to save a preset, then edit it, replace it with the preset you need.

To import Josh Meyer’s Male EQ preset available at

https://drive.google.com/file/d/163aSM4c-I6REKDqIzD9IzwiyDR4cXqma/view

First saved one of the preset. It asked for a name, I enter “sevrerok” as the preset name.

Close Audacity, Edited the file

/home/boby/.audacity-data/pluginsettings.cfg

Find the entry like

[pluginsettings/base64\:RWZmZWN0X0F1ZGFjaXR5X0F1ZGFjaXR5X0ZpbHRlciBDdXJ2ZQ\=\=/private/UserPresets/serverok]

Below this, you can add your preset. Here is what I have in the pluginsettings.cfg file

[pluginsettings/base64\:RWZmZWN0X0F1ZGFjaXR5X0F1ZGFjaXR5X0ZpbHRlciBDdXJ2ZQ\=\=/private/UserPresets/serverok]
Parameters=f0="62.77682" f1="70.002037" f10="336.65327" f11="492.91565" f12="591.0509" f13="689.68267" f14="776.07428" f15="889.28813" f16="982.67802" f17="9948.9608" f18="11195.196" f19="12597.538" f2="73.252718" f20="14047.435" f21="16096.677" f3="83.938837" f4="97.946153" f5="119.59827" f6="152.81833" f7="195.26572" f8="221.72906" f9="256.39197" FilterLength="8191" InterpolateLin="0" InterpolationMethod="B-spline" v0="-41.952381" v1="-10.904762" v10="0.031745911" v11="-2.984127" v12="-1.3650789" v13="-0.015872955" v14="0.469841" v15="0.469841" v16="-0.015872955" v17="-0.015872955" v18="-0.031746864" v19="-0.031746864" v2="-5.2349215" v20="-1.7301588" v21="-41.885715" v3="-1.6888895" v4="0.13650751" v5="1.1746035" v6="2" v7="2" v8="1.3015871" v9="0.031745911"

lspci command is used to list PCI devices on your computer.

To see all lspci command-line options

root@first-vm:~# lspci help
Usage: lspci []

Basic display modes:
-mm		Produce machine-readable output (single -m for an obsolete format)
-t		Show bus tree

Display options:
-v		Be verbose (-vv or -vvv for higher verbosity)
-k		Show kernel drivers handling each device
-x		Show hex-dump of the standard part of the config space
-xxx		Show hex-dump of the whole config space (dangerous; root only)
-xxxx		Show hex-dump of the 4096-byte extended config space (root only)
-b		Bus-centric view (addresses and IRQ's as seen by the bus)
-D		Always show domain numbers
-P		Display bridge path in addition to bus and device number
-PP		Display bus path in addition to bus and device number

Resolving of device ID's to names:
-n		Show numeric ID's
-nn		Show both textual and numeric ID's (names & numbers)
-q		Query the PCI ID database for unknown ID's via DNS
-qq		As above, but re-query locally cached entries
-Q		Query the PCI ID database for all ID's via DNS

Selection of devices:
-s [[[[]:]]:][][.[]]	Show only devices in selected slots
-d []:[][:]		Show only devices with specified ID's

Other options:
-i 	Use specified ID database instead of /usr/share/misc/pci.ids.gz
-p 	Look up kernel modules in a given file instead of default modules.pcimap
-M		Enable `bus mapping' mode (dangerous; root only)

PCI access options:
-A 	Use the specified PCI access method (see `-A help' for a list)
-O =	Set PCI access parameter (see `-O help' for a list)
-G		Enable PCI access debugging
-H 	Use direct hardware access ( = 1 or 2)
-F 	Read PCI configuration dump from a given file
root@first-vm:~# 

To list all PCI devices

root@first-vm:~# lspci
00:00.0 Host bridge: Intel Corporation Core Processor DMI (rev 11)
00:03.0 PCI bridge: Intel Corporation Core Processor PCI Express Root Port 1 (rev 11)
00:08.0 System peripheral: Intel Corporation Core Processor System Management Registers (rev 11)
00:08.1 System peripheral: Intel Corporation Core Processor Semaphore and Scratchpad Registers (rev 11)
00:08.2 System peripheral: Intel Corporation Core Processor System Control and Status Registers (rev 11)
00:08.3 System peripheral: Intel Corporation Core Processor Miscellaneous Registers (rev 11)
00:10.0 System peripheral: Intel Corporation Core Processor QPI Link (rev 11)
00:10.1 System peripheral: Intel Corporation Core Processor QPI Routing and Protocol Registers (rev 11)
00:1a.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 (rev 05)
00:1d.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a5)
00:1f.0 ISA bridge: Intel Corporation 3420 Chipset LPC Interface Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 6 port SATA AHCI Controller (rev 05)
01:00.0 Serial Attached SCSI controller: Broadcom / LSI SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 02)
02:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme II BCM5716 Gigabit Ethernet (rev 20)
02:00.1 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme II BCM5716 Gigabit Ethernet (rev 20)
03:03.0 VGA compatible controller: Matrox Electronics Systems Ltd. MGA G200eW WPCM450 (rev 0a)
ff:00.0 Host bridge: Intel Corporation Core Processor QuickPath Architecture Generic Non-Core Registers (rev 04)
ff:00.1 Host bridge: Intel Corporation Core Processor QuickPath Architecture System Address Decoder (rev 04)
ff:02.0 Host bridge: Intel Corporation Core Processor QPI Link 0 (rev 04)
ff:02.1 Host bridge: Intel Corporation Core Processor QPI Physical 0 (rev 04)
ff:03.0 Host bridge: Intel Corporation Core Processor Integrated Memory Controller (rev 04)
ff:03.1 Host bridge: Intel Corporation Core Processor Integrated Memory Controller Target Address Decoder (rev 04)
ff:03.2 Host bridge: Intel Corporation Core Processor Integrated Memory Controller Test Registers (rev 04)
ff:03.4 Host bridge: Intel Corporation Core Processor Integrated Memory Controller Test Registers (rev 04)
ff:04.0 Host bridge: Intel Corporation Core Processor Integrated Memory Controller Channel 0 Control Registers (rev 04)
ff:04.1 Host bridge: Intel Corporation Core Processor Integrated Memory Controller Channel 0 Address Registers (rev 04)
ff:04.2 Host bridge: Intel Corporation Core Processor Integrated Memory Controller Channel 0 Rank Registers (rev 04)
ff:04.3 Host bridge: Intel Corporation Core Processor Integrated Memory Controller Channel 0 Thermal Control Registers (rev 04)
ff:05.0 Host bridge: Intel Corporation Core Processor Integrated Memory Controller Channel 1 Control Registers (rev 04)
ff:05.1 Host bridge: Intel Corporation Core Processor Integrated Memory Controller Channel 1 Address Registers (rev 04)
ff:05.2 Host bridge: Intel Corporation Core Processor Integrated Memory Controller Channel 1 Rank Registers (rev 04)
ff:05.3 Host bridge: Intel Corporation Core Processor Integrated Memory Controller Channel 1 Thermal Control Registers (rev 04)
root@first-vm:~# 

To get detailed list

lspci -knn

bash: lspci: command not found