The 'database is locked' error probably comes from an SQLite database we use to store notebook signatures as part of the trust mechanism. This usually arises because the database file is on an NFS filesystem. The default location on Linux is ~/.local/share/jupyter/nbsignatures.db .
You can put the file somewhere else by configuring NotebookNotary.db_file . You can also set it to the special value ':memory:' to store the database in memory - but if you do this, restarting the notebook server will lose the signatures, so all notebooks will be untrusted, meaning HTML output won't show up until you re-run them. Thomas On 22 June 2017 at 20:30, Jing Gu <[email protected]> wrote: > Hi Everyone, > > I am trying to run Jupyter notebook on remote cluster. After I set up the > ssh tunnel from local machine to the remote cluster, I was able to open > Jupyter using local browser. However, when I tried to start a python 2 > notebook. there was an error saying "Unexpected error while saving file: > db/Untitled.ipynb database is locked". > > Anyone knows why this happened? > > > > Here are the error messages: > > [W 12:03:28.146 NotebookApp] Unexpected error while saving file: > db/Untitled.ipynb database is locked > > [E 12:03:28.147 NotebookApp] { > > "Origin": "http://localhost:2012";, > > "Content-Length": "19", > > "Accept-Language": "en-us", > > "Accept-Encoding": "gzip, deflate", > > "X-Xsrftoken": "2|6014fe0d|c26868538d97d756f800eb7b20932b > e1|1498152929", > > "Host": "localhost:2012", > > "Accept": "application/json, text/javascript, */*; q=0.01", > > "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) > AppleWebKit/603.2.4 (KHTML, like Gecko) Version/10.1.1 Safari/603.2.4", > > "Connection": "keep-alive", > > "X-Requested-With": "XMLHttpRequest", > > "Referer": "http://localhost:2012/tree/db";, > > "Cookie": "username-localhost-2012=\"2| > 1:0|10:1498154524|23:username-localhost-2012|44: > OTg2ZjM3NWZlZjQ1NDRmMDg4ZDdhYmEzZTY2ZDdhYTY=| > 8d539f0795b52dab2d9fc3a2a82d87c38d5df443b57e60c604d30f97837ce7ac\"; > username-localhost-1990=\"2|1:0|10:1498154202|23:username- > localhost-1990|44:MmVlZTJjMzJkNTY3NGMxODllMDhiZGE5MGU4ZDYxNDA=| > a92820eec04ba3d65b4f879c2dd8dee014043562bf8c7c36fc882e4d77ef91c0\"; > username-localhost-1991=\"2|1:0|10:1498153984|23:username- > localhost-1991|44:ZDBlOWYyNjZhZWFjNDY5N2FkZGMyZmMxY2Q2ZTFhZjM=| > bd9522d0266a48a413808cffe8d3f3f6c542201086ffc7f2d9974b2f81d3d6e3\"; > _xsrf=2|6014fe0d|c26868538d97d756f800eb7b20932be1|1498152929; > username-localhost-2048=\"2|1:0|10:1498152929|23:username- > localhost-2048|44:ZGU2NzAxZjQyODM5NDU4Nzg1N2NkYWJhMWIwYzU5ODE=| > 08aaac556d8e9b7397b8a4850a6cf1f8ff0fbf184556dcc5affad95934ab6085\"", > > "Content-Type": "application/json" > > } > > -- > You received this message because you are subscribed to the Google Groups > "Project Jupyter" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/jupyter/e41adb03-a33d-46f6-9086-2073eaf6240b%40googlegroups.com > <https://groups.google.com/d/msgid/jupyter/e41adb03-a33d-46f6-9086-2073eaf6240b%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Project Jupyter" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/jupyter/CAOvn4qiX4T05wDVWb8YZVQMyeg_tLCNP1K8zzZpnTeDQnrQrXQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
