Created Tue Jul, 28 2020 at 04:37PM

Ansible

*ansible-playbook --check* will not make any changes on remote systems. Any module instrumented to support "check mode" will report what changes they would have made rather than making them.

Command:

ansible-playbook sample.yml --check

Documentation: http://docs.ansible.com/ansible/latest/playbooks_checkmode.html

Apache HTTP Server

*configtest* runs a configuration file syntax test. It parses the configuration files and either reports Syntax Ok or detailed information about the particular syntax error.

Commands:

apachectl configtest
apachectl -t
httpd -t

Documentation: https://httpd.apache.org/docs/2.4/programs/apachectl.html

BIND

named-checkconf** checks the syntax, but not the semantics, of a named configuration file. named-checkzone** checks the syntax and integrity of a zone file.

Commands:

named-checkconf
named-checkconf /etc/named.conf
named-checkzone domain.com /var/named/zone.domain.com

Documentation:

CoreOS

The online tool validates the Ignition and coreos-cloudinit configs used with CoreOS Container Linux servers.

Tool: https://coreos.com/validate Documentation: https://coreos.com/validate

CUPS

*cupsd -f -t* runs cupsd in the foreground and tests the configuration file for syntax errors.

Commands:

cupsd -f -t
cupsd -f -t -c cupsd.conf

Documentation: https://www.cups.org/doc/man-cupsd.html

DHCP

dhcpd -t** will test the configuration file for correct syntax, but will not attempt to perform any network operations. dhcpd -T** can be used to test the lease database file in a similar way.

Commands:

dhcpd -t
dhcpd -t -cf dhcpd.conf
dhcpd -T

Documentation: https://linux.die.net/man/8/dhcpd

Docker Compose

*docker-compose config* validates the Docker Compose file.

Command:

docker-compose -f docker-compose.yml config

Documentation: https://docs.docker.com/compose/reference/config

Exim

*exim -bV* checks that the configuration file is syntactically valid.

Command:

exim -bV

Documentation: https://github.com/Exim/exim/wiki/TestingExim

Fluentd

*fluentd --dry-run* checks the Fluentd configuration without plugins start.

Command:

fluentd --dry-run -c fluent.conf

Documentation: https://docs.fluentd.org/v1.0/articles/config-file#check-configuration-file

HAProxy

*haproxy -c* checks the config file and exits with code 0 if no error was found, or exits with code 1 if a syntax error was found.

Command:

haproxy -c -f haproxy.cfg

Documentation: https://linux.die.net/man/1/haproxy

JSON

*python -m json.tool* provides a simple command line interface to validate and pretty-print JSON objects.

Command:

python -m json.tool sample.json > /dev/null

Documentation: https://docs.python.org/3/library/json.html#module-json.tool

Kickstart

*ksvalidator* verifies the syntax of a kickstart file, a text file that contains configuration information for a Red Hat Enterprise Linux installation.

Command:

ksvalidator -i

Documentation: https://www.mankier.com/1/ksvalidator

Lighttpd

*lighttpd -t* tests the configuration file for syntax errors and exits.

Command:

lighttpd -t -f lighttpd.conf

Documentation: https://linux.die.net/man/8/lighttpd

monit

*monit -t* run the syntax check for the control file.

Command:

monit -t

Documentation: https://linux.die.net/man/1/monit

MySQL

*mysqld --help --verbose* checks the MySQL configuration.

Command:

mysqld --help --verbose 1>/dev/null

Documentation: https://dev.mysql.com/doc/refman/5.7/en/server-options.html

Nagios

*nagios -v* verifies the information in the configuration files. Nagios will not start monitoring any hosts.

Commands:

nagios -v
nagios -v nagios.cfg

Documentation: https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/4/en/verifyconfig.html

NGINX

nginx -t** checks the configuration file for correct syntax and tries to open files referred in configuration. gixy** is a NGINX configuration static analyzer.

Commands:

nginx -t
nginx -t -c nginx.conf
gixy

Documentation:

OpenNTPD

*ntpd -n* runs Configtest mode. It only checks the configuration file for validity.

Command:

ntpd -n

Documentation: https://man.openbsd.org/ntpd

OpenLDAP

*slapd -Tt* tests whether the configuration file is correct or not.

Commands:

slapd -Tt
slapd -Tt -f /etc/openldap/slapd.conf

Documentation: https://linux.die.net/man/8/slapd

PHP

*php -i* shows PHP information.

Command:

php -i

Documentation: http://php.net/manual/en/features.commandline.options.php

Postfix

*postfix check* warns about bad directory/file ownership or permissions, and creates missing directories.

Command:

postfix check

Documentation: http://www.postfix.org/postfix.1.html

PostgreSQL

*pg_ctl reload* sends the postgres process a SIGHUP signal, causing it to reread its configuration files (postgresql.conf, pg_hba.conf). Validation errors will prevent the config from being reloaded, and errors will be logged into the Postgres log file.

Command:

pg_ctl reload

Documentation: https://www.postgresql.org/docs/9.5/static/app-pg-ctl.html

Puppet

*puppet parser validate* validates the syntax of one or more Puppet manifests. It validates the Puppet DSL syntax without compiling a catalog or syncing any resources.

Commands:

puppet parser validate
puppet parser validate manifest.pp

Documentation: https://puppet.com/docs/puppet/5.3/man/parser.html

Rsyslogd

*rsyslogd -N 1* checks the configuration file for correctness. This option is meant to verify a config file.

Command:

rsyslogd -N 1 -f /etc/rsyslog.conf

Documentation: https://linux.die.net/man/8/rsyslogd

Samba

*testparm* is a simple test program to check an smbd configuration file for internal correctness.

Command:

testparam -s

Documentation: https://www.samba.org/samba/docs/man/manpages-3/testparm.1.html

Splunk

splunk cmd btool check** checks for typos in stanza and setting names. This is the same conf checker that runs on splunk start**.

Command:

splunk cmd btool check

Documentation: http://docs.splunk.com/Documentation/Splunk/7.0.1/Troubleshooting/Usebtooltotroubleshootconfigurations

Squid

*squid -k parse* verifies the squid.conf file is valid.

Command:

squid -k parse

Documentation: https://linux.die.net/man/8/squid

SSH

sshd -t** is test mode. Only checks the validity of the configuration file and sanity of the keys. sshd -T** is extended test mode. Checks the validity of the configuration file, outputs the effective configuration to stdout and then exits.

Commands:

sshd -t
sshd -T

Documentation: https://linux.die.net/man/8/sshd

Syslogd

*syslogd -d* turns on debug mode, and writes much debug information on the current tty.

Commands:

syslogd -d
syslogd -d -f /etc/syslog.conf

Documentation: https://linux.die.net/man/8/syslogd

syslog-ng

*syslog-ng -s* verifies the syslog-ng configuration file is syntactically correct and exits.

Commands:

syslog-ng -s -f syslog-ng.conf
syslog-ng --syntax-only --cfgfile=syslog-ng.conf

Documentation: https://linux.die.net/man/8/syslog-ng

tcpd

*tcpdchk* examines your tcp wrapper configuration and reports all potential and real problems it can find.

Command:

tcpdchk

Documentation: https://www.freebsd.org/cgi/man.cgi?query=tcpdchk

Terraform

*terraform validate* validates the syntax of the terraform files. Terraform performs a syntax check on all the terraform files in the directory.

Command:

terraform validate

Documentation: https://www.terraform.io/docs/commands/validate.html

Travis

*travis lint* validates a .travis.yml reduces common build errors such as invalid YAML, missing language keys and unsupported runtime versions.

Command:

travis lint .travis.yml

Documentation: https://docs.travis-ci.com/user/travis-lint

Varnish

*varnishd -C* compiles the vlc file and if there's a problem, displays a compiler error.

Command:

varnishd -C -f sample.vlc

Documentation: https://linux.die.net/man/1/varnishd

vsftpd

*vsftpd olisten=NO* starts vsftpd and runs the configuration check, without listening on the network.

Command:

vsftpd olisten=NO

Documentation: https://linux.die.net/man/8/vsftpd

XML

*xmllint --schema* validates an XML file against an XML schema. xmllink is part of libxml.

Command:

xmllint --noout --schema sample.xsd sample.xml

Documentation: http://xmlsoft.org/xmllint.html

Xorg

*Xorg -config* tests manually created Xorg configuration files.

Command:

Xorg -config xorg.conf

Documentation: https://www.freebsd.org/doc/handbook/x-config.html

YAML

*yaml.rb* module provides a Ruby interface for data serialization in YAML format.

Command:

ruby -e "require 'yaml'; puts YAML.load_file('./data.yaml')"

Documentation: https://ruby-doc.org/stdlib-1.9.3/libdoc/yaml/rdoc/YAML.html