Compile and install openssl in Linux and generate the dynamic system connection Library dynamic/shared libraries

Openssl: a multi-purpose command line tool. Each function is implemented using sub-commands.
Libcrypto: public encryption library (stores various encryption algorithms)
Libssl: implementation of the ssl protocol

Yum-y install perl gcc

Http://zlib.net/zlib-1.2.8.tar.gz wget-4
Tar-zxvf zlib-1.2.8.tar.gz
Cd zlib-1.2.8
./Configure -- shared
Make
Make install

Cp libz. a/usr/local/lib
Chmod 644/usr/local/lib/libz.
Cp libz. so.1.2.8/usr/local/lib
Chmod 755/usr/local/lib/libz. so.1.2.8
Cp zlib.3/usr/local/share/man/man3
Chmod 644/usr/local/share/man/man3/zlib.3
Cp zlib. pc/usr/local/lib/pkgconfig
Chmod 644/usr/local/lib/pkgconfig/zlib. pc
Cp zlib. h zconf. h/usr/local/include
Chmod 644/usr/local/include/zlib. h/usr/local/include/zconf. h

Wget-4 -- no-check-certificate https://www.openssl.org/source/openssl-1.0.1t.tar.gz
Tar-zxvf openssl-1.0.1t.tar.gz
Cd openssl-1.0.1t
./Config -- prefix =/usr shared zlib
Make
Make install

Installing libcrypto.
Installing libssl.
Installing libcrypto. so.1.0.0
Installing libssl. so.1.0.0
Make [1]: Entering directory '/usr/lib64'
Make [2]: Entering directory '/usr/lib64'
Make [2]: Leaving directory '/usr/lib64'
Make [2]: Entering directory '/usr/lib64'
Make [2]: Leaving directory '/usr/lib64'
Make [1]: Leaving directory '/usr/lib64'
Cp libcrypto. pc/usr/lib64/pkgconfig
Chmod 644/usr/lib64/pkgconfig/libcrypto. pc
Cp libssl. pc/usr/lib64/pkgconfig
Chmod 644/usr/lib64/pkgconfig/libssl. pc
Cp openssl. pc/usr/lib64/pkgconfig
Chmod 644/usr/lib64/pkgconfig/openssl. pc

Another config method
./Config -- prefix =/usr/local/openssl-fPIC shared zlib
Cp-r/usr/local/openssl/include/openssl/usr/include/openssl Include stores the header files required for using OpenSSL libraries.
Cp-r/usr/local/openssl/lib/*/usr/lib64
In this way, you can continue to compile nginx.

#-FPIC: the dynamic link library in Linux. The "standard" approach is to compile the Code into Position Independent Code (PIC) and link it into a dynamic link library, it can run normally without being added, but it is created. so will have a warning.
# The ldd command is used to print the list of shared libraries that the program or library files depend on.

Ldd $ (which nginx)
Linux-vdso.so.1 => (0x00007fff079e7000)
Libdl. so.2 =>/lib64/libdl. so.2 (0x00007fbceb888000)
Libpthread. so.0 =>/lib64/libpthread. so.0 (0x00007fbceb66b000)
Libcrypt. so.1 =>/lib64/libcrypt. so.1 (0x00007fbceb433000)
Libpcre. so.0 =>/lib64/libpcre. so.0 (0x00007fbceb206000)
Libssl. so.1.0.0 =>/usr/lib64/libssl. so.1.0.0 (0x00007fbceafa2000)
Libcrypto. so.1.0.0 =>/usr/lib64/libcrypto. so.1.0.0 (0x00007fbceabc2000)
Libz. so.1 =>/lib64/libz. so.1 (0x00007fbcea9ac000)
Libc. so.6 =>/lib64/libc. so.6 (0x00007fbcea618000)
/Lib64/ld-linux-x86-64.so.2 (0x00007fbceba91000)
Libfreebl3.so =>/lib64/libfreebl3.so (0x00007fbcea414000)

If the -- prefix =/usr directory is another directory, you need to use ldconfig (a dynamic link library management command) to make the dynamic link library shared by the system
Echo "/usr/local/openssl/lib">/etc/ld. so. conf # Not Required
Ldconfig-v
Ldconfig is related to running the program and compilation.

Dynamic/shared libraries
/Lib/lib64 is kernel-level
/Usr/lib/usr/lib64 is system-level
/Usr/local/lib/usr/local/lib64 is user-level