#2471 closed defect (duplicate)

reopen logs root

Reported by: tehday@… Owned by:
Priority: trivial Milestone:
Component: nginx-core Version: 1.18.x
Keywords: logs reopenlogs owner chmod Cc:
uname -a: Linux 02-http 5.10.0-21-amd64 #1 SMP Debian 5.10.162-1 (2023-01-21) x86_64 GNU/Linux
nginx -V: nginx version: nginx/1.18.0
built with OpenSSL 1.1.1n 15 Mar 2022
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -ffile-prefix-map=/build/nginx-x3gsRV/nginx-1.18.0=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -Wdate-time -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -fPIC' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --modules-path=/usr/lib/nginx/modules --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-compat --with-debug --with-pcre-jit --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_dav_module --with-http_slice_module --with-threads --with-http_addition_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_sub_module


debian stable (11.6)
nginx from official debian repo (nginx-full1.18.0-6.1+deb11u3)

when nginx justs start and logs files not exists, nginx creates log files with root:root owner and mod (644) so it looks good as expected

on kill -USR1 (reopen logs) nginx drop logs privileges to www-data an recreate them with www-data:root, makes them writable to www-data user, not sure this is bug or feature? look like bug for me

expected behavior keep logs root accessible only

Change History (1)

comment:1 by Maxim Dounin, 16 months ago

Resolution: duplicate
Status: newclosed

Since nginx reopens logs in the worker processes, it needs write access for the nginx user when reopening logs, and changes log file ownership accordingly. See #376 for more details and discussion of an alternative approach to log rotation.

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