The above will output: COBOL has historically been very secretive and low key. Its domain of use being very secretive and low key.
I have been using 5 RPis as a camera with motion detection and post-processing. This application requires high reliability and it was a pretty long journey until all the issues were solved. Connectivity Of course, the first thing you need is proper connectivity, especially if you have your RPi on a remote location.
There are many wifi dongles and most of them are very bad poor signal quality. This works for me — https: Remote shell Related to the Connectivity.
You need to be able to connect there remotely. It is just for an inspiration, you need to edit it for your setup. Basically after boot or wifi re-connection, RPi connects to my server and starts reverse-port-forwarding so I can access RPi from my server.
That improves life a lot. Bad SD card To survive an unexpected poweroff, you need to have all filesystem mounted read-only more about it later. But first… even if you have your FS read-only, a cheap SD card can destroy the data on the card itself.
Unless you have special requirements, there are only a few paths which needs to be writable. That may complicate the update later… 4. Install busybox syslog instad. It logs into memory and is very lightweight. You can then use logread command to read syslog ringbuffer from the memory when needed.
Also clock keeping is poor on a standard RPi so you may consider updating time regularly every hour or two should be enough. I used ntpdate for this. DHCP lease is the major problem. Simple solution is to delete the old directory and make it as a symlink to tmp like this: If you use alsamixer to set up volume level, make sure to do so in read-write filesystem.
Watchdog It is useful to set up a watchdog which can reboot your RPi in case something is unresponsive or eating CPU too much. Setting a minimum free RAM amount is a good idea.
Before starting the watchdog, be prepared that you may have configured it wrongly and it will reboot immediately when you start it and may continuously reboot after each boot.
So be prepared to modify your SD card on a different device if that happens. It rebooted my box once while I was doing some filesystem changes. Fortunately it booted fine for me, but it may not for you and may require manual, local fix.
In addition to the watchdog, you should set up reboot after a kernel panic.
I think you can somehow enable sending busybox syslog over the network. I made my own script for this purpose, though. Simple and helped a few times.
If you can ensure it somehow, then fine, use cron. If not and using relative time is enough, you can make a fake cron using bash script, while loop and wait commands. If you did everything correctly, it will boot just fine.When the application didn't have permission to access the file, it gave me this error: attempt to write a readonly database Wh Stack Exchange Network Stack Exchange network consists of Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build .
What operating systems does Subversion run on? ¶ All modern flavors of Unix, Windows, BeOS, OS/2, macOS.
Subversion is written in ANSI C and uses APR, the Apache Portable Runtime library, as a portability layer. The Subversion client will run anywhere APR runs, which is most places. Programming in Delphi Introduction. The Delphi language was formerly known as Object Pascal, and is an object-oriented version of the venerable Pascal language, combined by Borland with a Visual Basic-like RAD tool that lets you write fast GUI applications with no run-time, a very rich set of components (VCLs) that can be statically compiled into the EXE, and an encapsulation of most of the.
Attempt to write a read-only database attempt to write a readonly database Description: An unhandled exception occurred during the execution of the current web request.
Abstract. This specification defines an API for storing data in databases that can be queried using a variant of SQL.
Status of This Document. Beware. [ashio-midori.com] · SVN Dev · SVN Users · SVN Org · TSVN Dev · TSVN Users · Subclipse Dev · Subclipse Users · this month's index svn: attempt to write a readonly database This message: [ Message body ] [ More options ].