Apache server -- multiple directories, different error logs - apache2

Question

I have two directories in /var/www (say, /var/www/app1 and /var/www/app2) whose error logs I want sent to different files. Both are under the same domain, so I think that I can't put them under different virtual hosts. So, for example, I would access them as:
http://localhost/app1
http://localhost/app2
I came across this page:
Generate access logs for different subdirectories in Apache
whose solution works perfectly for the access logs. However, the "env" argument doesn't seem to work with the ErrorLog directive.
Before this "discovery", I was working on this, which seems wrong:
<VirtualHost *:80>
ServerAdmin ray#localhost
DocumentRoot /var/www/app1
<Directory />
Options Indexes FollowSymLinks MultiViews
AllowOverride None
Order deny,allow
allow from all
</Directory>
ErrorLog ${APACHE_LOG_DIR}/app1/error.log
LogLevel warn
CustomLog ${APACHE_LOG_DIR}/app1/access.log combined
</VirtualHost>
I'm somewhat lost about what I should be doing. That is, if there is some way to get ErrorLog to work or if I should keep trying with configuring a virtual host for each directory. Any help would be appreciated! Thank you!

Answer 1

Why do you set Directory options for / in the VirtualHost context? Use <Directory /var/www/app1> instead of <Directory />
Due to the Apache ErrorLog directive docs its context is server config, virtual host - which means that it's only possible to define ErrorLog for the whole server or for a VirtalHost, not for a Directory. So if you want to send different logs to different files, try to use SetEnvIf to set an Env variable. Depeding on the directory where you are, it should be something like SetEnvIf Request_URI ^\/a1\/ a1 and SetEnvIf Request_URI ^\/a2\/ !a1. Then write logs depending on the a1 environment variable.

Answer 2

Set custom ID for every Directory and you can separate logs by directories like this:
<Directory app1>
SetEnv app1
</Directory>
<Directory app2>
SetEnv app2
</Directory>
CustomLog ${APACHE_LOG_DIR}/site1.log combined env=app1
CustomLog ${APACHE_LOG_DIR}/site2.log combined env=app2

Answer 3

Finally I did it, first create internal subdomains per folder and with proxypass pass the subdomain content.
Enable apache mods:
a2enmod authz_core dir proxy proxy_http
/etc/hosts
127.0.0.1 localhost
127.0.0.1 a.localhost
127.0.0.1 b.localhost
/etc/apache2/sites-available/default.conf
<VirtualHost *:80>
ServerName localhost
ServerAdmin fake#mail.com
DocumentRoot "/dev/null"
ProxyPass /a http://a.localhost/
ProxyPassReverse /a http://a.localhost/
ProxyPass /b http://b.localhost/
ProxyPassReverse /b http://b.localhost/
LogLevel debug
ErrorLog ${APACHE_LOG_DIR}/default-error.log
CustomLog ${APACHE_LOG_DIR}/default-access.log combined
</VirtualHost>
/etc/apache2/sites-available/a.conf
<VirtualHost *:80>
ServerName a.localhost
ServerAdmin fake#mail.com
DocumentRoot "/Publikoa/a"
<Directory "/Publikoa/a">
DirectoryIndex index.html
Require all granted
</Directory>
LogLevel debug
ErrorLog ${APACHE_LOG_DIR}/a-error.log
CustomLog ${APACHE_LOG_DIR}/a-access.log combined
</VirtualHost>
/etc/apache2/sites-available/b.conf
<VirtualHost *:80>
ServerName b.localhost
ServerAdmin fake#mail.com
DocumentRoot "/Publikoa/b"
<Directory "Publikoa/b">
DirectoryIndex index.html
Require all granted
</Directory>
LogLevel debug
ErrorLog ${APACHE_LOG_DIR}/b-error.log
CustomLog ${APACHE_LOG_DIR}/b-access.log combined
</VirtualHost>
Enable sites:
a2ensite default a b
Restart apache:
/etc/init.d/apache2 restart