remove installation instructions for CentOS 7

This ends official support for CentOS 7.

docs/CMakeLists.txt

@@ -23,7 +23,6 @@ foreach (src ${DOC_SOURCES})
 endforeach()
 
 ADD_CUSTOM_TARGET(doc
-   COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/bash2md.sh ${PROJECT_SOURCE_DIR}/vagrant/Install-on-Centos-7.sh ${CMAKE_CURRENT_BINARY_DIR}/appendix/Install-on-Centos-7.md
    COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/bash2md.sh ${PROJECT_SOURCE_DIR}/vagrant/Install-on-Centos-8.sh ${CMAKE_CURRENT_BINARY_DIR}/appendix/Install-on-Centos-8.md
    COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/bash2md.sh ${PROJECT_SOURCE_DIR}/vagrant/Install-on-Ubuntu-18.sh ${CMAKE_CURRENT_BINARY_DIR}/appendix/Install-on-Ubuntu-18.md
    COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/bash2md.sh ${PROJECT_SOURCE_DIR}/vagrant/Install-on-Ubuntu-20.sh ${CMAKE_CURRENT_BINARY_DIR}/appendix/Install-on-Ubuntu-20.md

docs/admin/Faq.md

@@ -106,11 +106,6 @@ If you are using a flatnode file, then it may also be that the underlying
 filesystem does not fully support 'mmap'. A notable candidate is virtualbox's
 vboxfs.
 
-### I see the error: "clang: Command not found" on CentOS
-
-On CentOS 7 users reported `/opt/rh/llvm-toolset-7/root/usr/bin/clang: Command not found`.
-Double-check clang is installed. Instead of `make` try running `make CLANG=true`.
-
 ### nominatim UPDATE failed: ERROR: buffer 179261 is not owned by resource owner Portal
 
 Several users [reported this](https://github.com/openstreetmap/Nominatim/issues/1168)
@@ -126,22 +121,6 @@ The server cannot access your database. Add `&debug=1` to your URL
 to get the full error message.
 
 
-### On CentOS the website shows "Could not connect to server"
-
-`could not connect to server: No such file or directory`
-
-On CentOS v7 the PostgreSQL server is started with `systemd`. Check if
-`/usr/lib/systemd/system/httpd.service` contains a line `PrivateTmp=true`. If
-so then Apache cannot see the `/tmp/.s.PGSQL.5432` file. It's a good security
-feature, so use the
-[preferred solution](../appendix/Install-on-Centos-7.md#adding-selinux-security-settings).
-
-However, you can solve this the quick and dirty way by commenting out that line and then run
-
-    sudo systemctl daemon-reload
-    sudo systemctl restart httpd
-
-
 ### Website reports "DB Error: insufficient permissions"
 
 The user the webserver, e.g. Apache, runs under needs to have access to the
@@ -182,7 +161,7 @@ by everybody, e.g.
 Try `chmod a+r nominatim.so; chmod a+x nominatim.so`.
 
 When running SELinux, make sure that the
-[context is set up correctly](../appendix/Install-on-Centos-7.md#adding-selinux-security-settings).
+[context is set up correctly](../appendix/Install-on-Centos-8.md#adding-selinux-security-settings).
 
 When you recently updated your operating system, updated PostgreSQL to
 a new version or moved files (e.g. the build directory) you should

docs/admin/Installation.md

@@ -7,7 +7,6 @@ the following operating systems:
   * [Ubuntu 20.04](../appendix/Install-on-Ubuntu-20.md)
   * [Ubuntu 18.04](../appendix/Install-on-Ubuntu-18.md)
   * [CentOS 8](../appendix/Install-on-Centos-8.md)
-  * [CentOS 7.2](../appendix/Install-on-Centos-7.md)
 
 These OS-specific instructions can also be found in executable form
 in the `vagrant/` directory.

docs/mkdocs.yml

@@ -42,7 +42,6 @@ pages:
         - 'Testing' : 'develop/Testing.md'
         - 'External Data Sources': 'develop/data-sources.md'
     - 'Appendix':
-        - 'Installation on CentOS 7' : 'appendix/Install-on-Centos-7.md'
         - 'Installation on CentOS 8' : 'appendix/Install-on-Centos-8.md'
         - 'Installation on Ubuntu 18' : 'appendix/Install-on-Ubuntu-18.md'
         - 'Installation on Ubuntu 20' : 'appendix/Install-on-Ubuntu-20.md'