Cannot load /etc/httpd/modules/mod_auth_basic.so

apache-2.2

After trying to upgrade apache 2.2.3 to 2.4.7 by compiling 2.4.7 from scratch. Im getting the following error,

[root@test httpd-2.4.7]# /etc/init.d/httpd start
Starting httpd: httpd: Syntax error on line 149 of /etc/httpd/conf/httpd.conf: Cannot load /etc/httpd/modules/mod_auth_basic.so into server: /etc/httpd/modules/mod_auth_basic.so: undefined symbol: ap_expr_str_exec
                                                           [FAILED]

However the file is there,

/etc/httpd/modules/mod_auth_basic.so: ELF 64-bit LSB shared object, AMD x86-64, version 1 (SYSV), not stripped

My original conf for 2.2.3 was in /etc/httpd and the commands I ran to compile were,

cd apr-1.5.0/
./configure --prefix=/usr/local/apr-httpd/
make
make install

cd ../apr-util-1.5.3/
./configure --prefix=/usr/local/apr-util-httpd/ --with-apr=/usr/local/apr-httpd/
make
make install

cd ../pcre-8.32/
./configure --prefix=/usr/local/pcre-8.32
make
make install


cd ../httpd-2.4.7/
./configure --with-apr=/usr/local/apr-httpd/ --with-apr-util=/usr/local/apr-util-httpd/ --with-pcre=/usr/local/pcre-8.32/ --prefix=/etc/httpd
make 
make install

Any Ideas ?

Best Answer

ap_expr_str_exec is an API function that was newly introduced in the Apache httpd 2.4 core. The error is your runtime linker complaining that the mod_auth_basic.so module needs to resolve the ap_expr_str_exec symbol, but that it wasn't found.

You can verify this with the output of the readelf command:

$ readelf -s modules/mod_auth_basic.so
   Num:    Value          Size Type    Bind   Vis      Ndx Name
   ...
     3: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND ap_expr_str_exec
   ...

The UND value for the symbol index means that it is undefined and therefore must be resolved at runtime.

So, since your module is referencing a 2.4 symbol but your running executable doesn't have it, it looks like trying to load an httpd 2.4 module into an httpd 2.2 instance. Make sure you're definitely running the correct httpd binary.

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Compiling Apache mod_ssl for different target hardware (hardware capability unsupported SSE2 error)

Here are the steps that I have done to successfully build and install the Apache httpd-2.4.10 and OpenSSL openssl-1.0.1j on Solaris 10.

Download following software
openssl-1.0.1j.tar.gz
httpd-2.4.10.tar.gz
apr-1.5.1.tar.gz
apr-util-1.5.4.tar.gz
pcre-8.36.tar.gz
Verify Make and CC
By default gcc is at /usr/sfw/bin/gcc and make is at /usr/ccs/bin/make

Include following in the PATH
usr/local/ssl/bin:/usr/sfw/bin:/usr/local/bin:/usr/ccs/bin

Include following in the LD_LIBRARY_PATH
/usr/local/lib:/usr/local/ssl/lib
Build and install openssl-1.0.1j
Unzip and un-tar openssl-1.0.1j.tar.gz to /usr/local/openssl-1.0.1j
Execute following commands in order. The shared parameter is very important so that it can be linked with httpd-2.4.10 build for SSL enabling.
```
$ cd /usr/local/openssl-1.0.1j
$ ./config shared
$ make
$ make test
$ make install
```
By default it installs openssl at /usr/local/ssl
Install pcre-8.36 Unzip and un-tar pcre-8.36.tar.gz to /usr/local/ pcre-8.36

Execute following commands in order
```
$ cd /usr/local/ pcre-8.36
$ ./configure 
$ make
$ make install
```
By default, make install installs the package's commands under /usr/local/bin, include files under /usr/local/include, etc.
Build and install httpd-2.4.10

Unzip and un-tar httpd-2.4.10.tar.gz to /usr/local/httpd-2.4.10

Unzip and un-tar apr-1.5.1.tar.gz to /usr/local/httpd-2.4.10/srclib
Rename /usr/local/apr-1.5.1 to /usr/local/apr

Unzip and un-tar apr-util-1.5.4.tar.gz to /usr/local/httpd-2.4.10/srclib
Rename /usr/local/apr-util to /usr/local/apr-util

Execute following commands in order
```
$ ./configure --prefix=/usr/local/apache2 --with-included-apr --enable-so –enable-ssl=shared --with-ssl=/usr/local/ssl
$ make
$ make install
```
It installs it at /usr/local/apache2

The installation is complete. To enable SSL and Proxy, update /usr/local/apache2/conf/httpd.conf with uncommentting following lines

LoadModule socache_shmcb_module modules/mod_socache_shmcb.so

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_connect_module modules/mod_proxy_connect.so
LoadModule proxy_ftp_module modules/mod_proxy_ftp.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule proxy_fcgi_module modules/mod_proxy_fcgi.so
LoadModule proxy_scgi_module modules/mod_proxy_scgi.so
LoadModule proxy_wstunnel_module modules/mod_proxy_wstunnel.so
LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule proxy_express_module modules/mod_proxy_express.so

LoadModule slotmem_shm_module modules/mod_slotmem_shm.so
LoadModule ssl_module modules/mod_ssl.so

Include conf/extra/httpd-ssl.conf

Now you can work on httpd-ssl.conf as you usually do to complete your configuration

Php – Linking PHP extension (symbol lookup error)

You have to add /usr/local/lib to library path. Create /etc/ld.so.conf.d/nmcryptgate.conf with the following content:

/usr/local/lib

Then run:

sudo ldconfig

Test the PHP again. Apache restart might be required.

Best Answer

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Compiling Apache mod_ssl for different target hardware (hardware capability unsupported SSE2 error)

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