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--- linux_wiki:library_paths [2018/06/19 16:16]
billdozor [Override Search Order]
+++ linux_wiki:library_paths [2019/05/25 23:50]
@@ Line 1: / Line 1: @@
-====== Library Paths ======
-**General Information**
-Configuring and viewing OS library paths.
-**Checklist**
-  * Distro(s): Enterprise Linux 6/7
-----
-====== Library Config Files ======
-**Main Config File**: /etc/ld.so.conf includes a directory
-<code bash>
-include ld.so.conf.d/*.conf
-</code>
-\\
-**Directory of drop in paths**: /etc/ld.so.conf.d/
-\\
-Example: /etc/ld.so.conf.d/mylibraries.conf
-<code bash>
-/data/lib/application1/
-/data/lib/application2/
-</code>
-\\
-Apply Changes: If any changes are made to the above config files, run ldconfig to reload the library cache
-<code bash>
-ldconfig -v
-</code>
-  * -v => verbose
-----
-====== Library Search Order ======
-Shared libraries needed by programs are searched for in this order:
-  * Environment variable "LD_LIBRARY_PATH" => This environmental variable can be set like any other environment variable. (shell, .bashrc, .profile)
-  * (ELF binaries only) => Directories specified within the binary. (DT_RUNPATH)
-  * From cache file (/etc/ld.so.cache) => created via ldconfig
-  * In default system library paths (/lib, /lib64, /usr/lib)
-====== Override Search Order ======
-To get a path specified in front of another, define the environmental variable "LD_LIBRARY_PATH" in a configuration file (per user or system wide).
-\\
-Example: Ensure that /usr/lib64 is ahead of /usr/local/lib for user "robert"
-<code bash>
-vim /home/robert/.bashrc
-LD_LIBRARY_PATH=/usr/lib64:${LD_LIBRARY_PATH}
-</code>
-  * Including the "${LD_LIBRARY_PATH}" as a second entry ensures that nothing is completely over written if the variable has been set elsewhere
-----