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./observer --help
./observer: error while loading shared libraries: libmariadb.so.3: cannot open shared object file: No such file or directory

2.做一个strace跟踪，发现是某些lib文件无法找到

 strace ./observer 

输出截取如下：

openat(AT_FDCWD, "/usr/lib/libmariadb.so.3", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
writev(2, [{iov_base="./observer", iov_len=10}, {iov_base=": ", iov_len=2}, {iov_base="error while loading shared libra"..., iov_len=36}, {iov_base=": ", iov_len=2}, {iov_base="libmariadb.so.3", iov_len=15}, {iov_base=": ", iov_len=2}, {iov_base="cannot open shared object file", iov_len=30}, {iov_base=": ", iov_len=2}, {iov_base="No such file or directory", iov_len=25}, {iov_base="\n", iov_len=1}], 10./observer: error while loading shared libraries: libmariadb.so.3: cannot open shared object file: No such file or directory
) = 125
exit_group(127)                         = ?
+++ exited with 127 +++
obadmin@obsrv01:~/myoceanb

4.使用ldd查看observer依赖的lib库文件,结果有libmariadb.so.3，libaio.so.1两个文件是not found

obadmin@obsrv01:~/myoceanbase/oceanbase/bin$ ldd ./observerlinux-vdso.so.1 (0x00007ffd27bdb000)librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007ff1f16cd000)libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007ff1f16c8000)libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007ff1f15df000)libmariadb.so.3 => not foundlibaio.so.1 => not found libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007ff1f15d8000)libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ff1c7a00000)/lib64/ld-linux-x86-64.so.2 (0x00007ff1f16da000)

5.使用find查找文件时，发现oceanbase的lib库文件夹实际上有这个文件

 sudo find / -name libmariadb.so.3
/home/obadmin/.obd/repository/oceanbase-ce-libs/4.3.1.0/68f0b5f988bd5fb80d44ac29afad0c2b2f2d3763/libmariadb.so.3
/home/obadmin/myoceanbase/oceanbase/lib/libmariadb.so.3

6.使用ls确认，libmariadb与libaio两个文件都在/home/obadmin/myoceanbase/oceanbase/lib/文件夹下

 ls /home/obadmin/myoceanbase/oceanbase/lib/libmariadb.so /home/obadmin/myoceanbase/oceanbase/lib/libaio.so.1.0.1
/home/obadmin/myoceanbase/oceanbase/lib/libaio.so.1.0.1
/home/obadmin/myoceanbase/oceanbase/lib/libmariadb.so

7.查询$LD_LIBRARY_PATH,结果返回空值

echo $LD_LIBRARY_PATH

8.设置LD_LIBRARY_PATH

export LD_LIBRARY_PATH=/home/obadmin/myoceanbase/oceanbase/lib

9.再次查询LD_LIBRARY_PATH变量，这回有值了

 echo $LD_LIBRARY_PATH
/home/obadmin/myoceanbase/oceanbase/lib

10.再次运行observer

 ./observer --help
./observer --help
observer [OPTIONS]-h,--help                print this help-z,--zone ZONE           zone-p,--mysql_port PORT     mysql port-P,--rpc_port PORT       rpc port-N,--nodaemon            don't run in daemon-n,--appname APPNAME     application name-c,--cluster_id ID       cluster id-d,--data_dir DIR        OceanBase data directory-i,--devname DEV         net dev interface-I,--local_ip            ip of the current machine-o,--optstr OPTSTR       extra options string-r,--rs_list RS_LIST     root service list-l,--log_level LOG_LEVEL server log level-6,--ipv6 USE_IPV6       server use ipv6 address-m,--mode MODE server mode-f,--scn flashback_scn