s3cmd SSL connection error

Problem Statement

 File "/usr/lib/python2.7/httplib.py", line 1263, in connect
    server_hostname=server_hostname)
  File "/usr/lib/python2.7/ssl.py", line 363, in wrap_socket
    _context=self)
  File "/usr/lib/python2.7/ssl.py", line 611, in __init__
    self.do_handshake()
  File "/usr/lib/python2.7/ssl.py", line 840, in do_handshake
    self._sslobj.do_handshake()
error: [Errno 0] Error

Environement

• Debian 9
• s3cmd 2.0.1

Solution

The problem happens due to SSL issue. To make s3cmd work, we should invoke it without SSL (–nossl) as following.

s3cmd --no-ssl get --access_key=5DTA7J1ORIQ3E7LMV9YD 
--secret_key=GIqPAez7zdHSC9r3HsMNOgJlHqHttvGi
 --host=10.xx.xx.xxx:80 --host-bucket=10.xx.xx.xx:80
 s3://TESTBUCKET/abc.tgz

References

• https://sourceforge.net/p/s3tools/mailman/message/34389949/

MySQL & Python- Error: 2006 mysql has gone away

MySQL & Python: Error: 2006 mysql has gone away

This problem occurs for multiple reasons such as DB connection problem. In our code, we hit this issue due to a subtle problem with DB cursor.

The code was as following:

with conn as cur:
    try:
        print "hello"
    except:
        print "sorry"
    finally: 
        conn.close()

The above code would throw the error 2016 mysql has gone away exception. The problem lies in with conn as cur. This statement creates a cursor on the DB and the cursor object autmatically gets destroyed.
Here, we are closing the DB connection before the automatic destruction happened.

So since connection was invalid(closed), cursor deletion hit an exception.

The solution is to close the connection after cursor object deletion.

try:
    with conn as cur:
        print "hello"
except:
    print "sorry"
finally: 
    conn.close()

Written with StackEdit.

Building Ceph on Debian Jessie

1. Checkout Ceph with --recursive
2. Comment code that installs setuptools and sudo ./install-deps.sh
3. ./ceph/do_cmake.sh.
4. Switch to root using sudo su and run the following commands:

    echo "LC_ALL=en_US.UTF-8" >> /etc/environment   
        echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen 
        echo "LANG=en_US.UTF-8" > /etc/locale.conf
        locale-gen en_US.UTF-8

6. Now switch back to your login and create ~/.bash_profile:

    $ cat ~/.bash_profile  
    export LC_ALL=en_US.UTF-8  
    export LANG=en_US.UTF-8

7. Run source ~/.bash_profile
8. cd to ./ceph/build and run make -j 4