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Hosting Operations

Read-only, can be slow

Map Apache Proxy Rules

You need to find Apache ProxyPass and ProxyPassReverse rules.

Command

grep -RInE '^[[:space:]]*(ProxyPass|ProxyPassReverse)[[:space:]]' fixtures/apache/sites-enabled

Before you run this

System impact: Read-only. Can create load on large logs, directories, filesystems, or process tables.

When not to use it: Do not assume the backend is healthy just because ProxyPass points to it.

Expected output

Config files and Apache proxy target rules.

System impact

Read-only, can be slow. Nothing changes. The command lists Apache proxy directives.

Scope this to the smallest useful path or service on busy systems.

Recovery / rollback: no state is changed.

When to use it

Use when Apache returns proxy errors or forwards traffic to the wrong backend.

When not to use it

Do not assume the backend is healthy just because ProxyPass points to it.

Watch this command run

Command transcript

This sanitized transcript shows the commands and output shape without exposing host details.

demo@lab:~$

$ grep -RInE '^[[:space:]]*(ProxyPass|ProxyPassReverse)[[:space:]]' sample-files/apache/sites-enabled

sample-files/apache/sites-enabled/app.conf:5:    ProxyPass / http://localhost:7000/
sample-files/apache/sites-enabled/app.conf:6:    ProxyPassReverse / http://localhost:7000/

$ grep -RInE 'ProxyPreserveHost|ServerName' sample-files/apache/sites-enabled

sample-files/apache/sites-enabled/app.conf:2:    ServerName example.com
sample-files/apache/sites-enabled/app.conf:4:    ProxyPreserveHost On
sample-files/apache/sites-enabled/example.conf:2:    ServerName example.com
View commands shown

These are the commands shown in the sanitized transcript.

Commands shown

  1. grep -RInE '^[[:space:]]*(ProxyPass|ProxyPassReverse)[[:space:]]' fixtures/apache/sites-enabled
  2. grep -RInE 'ProxyPreserveHost|ServerName' fixtures/apache/sites-enabled

next steps

Related commands

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Apache was serving files from a different directory than expected.

grep -RInE '^[[:space:]]*DocumentRoot[[:space:]]' fixtures/apache/sites-enabled
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Map Nginx Proxy Targets

Nginx was healthy. It was proxying to the wrong place.

grep -RInE '^[[:space:]]*proxy_pass[[:space:]]' fixtures/nginx/conf.d fixtures/nginx/sites-enabled
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Find Web Server Redirect Rules

The redirect loop was hiding in plain text.

grep -RInE 'return[[:space:]]+30[18]|rewrite[[:space:]]|Redirect[[:space:]]|RewriteRule|RewriteCond' fixtures/nginx fixtures/apache
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Map Nginx Roots and Aliases

The URL was right. The filesystem path was not.

grep -RInE '^[[:space:]]*(root|alias)[[:space:]]' fixtures/nginx/conf.d fixtures/nginx/sites-enabled
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List Nginx Listen Directives

The site was configured, but the port was not.

grep -RInE '^[[:space:]]*listen[[:space:]]' fixtures/nginx/conf.d fixtures/nginx/sites-enabled
Study mapping

Use this as independent command practice: read the notes, predict the output, then compare it with the example before using a real shell.

  • lpic1:103-gnu-unix-commands
  • lfcs:essential-commands
  • lfcs:operations-deployment
  • lfcs:services-logs
  • linuxplus:automation-scripting
  • linuxplus:provisional
  • risk:read-only

Useful for

  • LPIC-1 style command-line practice
  • LFCS style performance tasks
  • Linux+ style troubleshooting review

Independent study support only. No affiliation, endorsement, exam dumps, or real exam questions.