Mogdb libpython3.6m.so.1.0: cannot open shared object file: No such file or directory报错排查

问题现象

• 执行gs_om -t status --detail命令查询MogDB各实例情况，出现以下报错

[omm@raca1 ~]$ gs_om -t status --detail
Traceback (most recent call last):
  File "/opt/mogdb/tool/script/gspylib/common/Common.py", line 63, in <module>
    import psutil
  File "/opt/mogdb/tool/script/gspylib/common/../../../lib/psutil/__init__.py", line 102, in <module>
    from . import _pslinux as _psplatform
  File "/opt/mogdb/tool/script/gspylib/common/../../../lib/psutil/_pslinux.py", line 26, in <module>
    from . import _psutil_linux as cext
ImportError: libpython3.6m.so.1.0: cannot open shared object file: No such file or directory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/mogdb/tool/script/gs_om", line 29, in <module>
    from gspylib.common.ParameterParsecheck import Parameter
  File "/opt/mogdb/tool/script/gspylib/common/ParameterParsecheck.py", line 27, in <module>
    from gspylib.common.Common import DefaultValue
  File "/opt/mogdb/tool/script/gspylib/common/Common.py", line 97, in <module>
    import psutil
  File "/opt/mogdb/tool/script/gspylib/common/../../../lib/psutil/__init__.py", line 102, in <module>
    from . import _pslinux as _psplatform
  File "/opt/mogdb/tool/script/gspylib/common/../../../lib/psutil/_pslinux.py", line 26, in <module>
    from . import _psutil_linux as cext
ImportError: libpython3.6m.so.1.0: cannot open shared object file: No such file or directory
[omm@raca1 ~]$ 

问题排查

• 1）查找是否有libpython3.6m.so.1.0文件，发现该主机上并不存在该文件

[root@raca1 ~]# find / -name libpython3.6m.so.1.0
[root@raca1 ~]# 

• 2）查看当前主机的python信息，当前主机已经安装了python3

[root@raca1 ~]# python -V
Python 2.7.5
[root@raca1 ~]# python3 -V
Python 3.6.8

• 3）查看python3的lib目录，发现该目录下不存在.so文件

[root@raca1 lib]# pwd
/usr/local/python3/lib
[root@raca1 lib]# ll
total 21352
-r-xr-xr-x  1 root root 21849616 Feb 26  2021 libpython3.6m.a
drwxr-xr-x  2 root root       67 Feb 26  2021 pkgconfig
drwxr-xr-x 35 root root     8192 Feb 26  2021 python3.6

问题解决

• 问题原因：编译python3时，没有加载动态库
• 1）将python3安装到另一个目录/root/python3，编译时使用--enable-shared CFLAGS=-fPIC加载动态库文件

[root@raca1 ~]# cd Python-3.6.8/
[root@raca1 Python-3.6.8]# ./configure --prefix=/root/python3 --enable-shared CFLAGS=-fPIC
[root@raca1 Python-3.6.8]# make
[root@raca1 Python-3.6.8]# make install

• 2）复制libpython3.6m.so.1.0到/usr/lib64目录下即可解决报错

[root@raca1 ~]# cd /root/python3/lib
[root@raca1 lib]# cp libpython3.6m.so.1.0 /usr/lib64

• 3）可以成功调用gs_om命令

[omm@raca1 ~]$ gs_om -t status --detail
[   Cluster State   ]

cluster_state   : Normal
redistributing  : No
current_az      : AZ_ALL

[  Datanode State   ]

    node node_ip         port      instance                state
--------------------------------------------------------------------------------
1  raca1 10.62.228.76    26000      6001 /opt/mogdb/data   P Primary Normal