Re: [mapserver-users] Mapcache: error with Berkeley DB and display tiles
Andreas, thanks for the explanation about the Berkeley Database.
However, I have made several changes of permissions and owner of the
files produced by mapcache_seed, and I still get the same error on
the OpenLayers demo.
I don't know if others users have had the same error with Mapcache
and Berkeley Databases in Ubuntu Server.
Have you build mapcache yourself or do you use a prebuild one? Today I build
mapcache with BerkeleyDB support on a Debian Testing box. Basically, this is
what I did:
* check out latest master
* apt-get install libdb5.1-dev
* follow the install instructions in INSTALL, add -DWITH_BERKELEY_DB=ON to
cmake .. and make sure * Berkeley DB: /usr/lib/... is listed under
Optional components
* add the following config element to mapcache.xml if it does not exist yet:
cache name=bdb type=bdb
!-- base (required)
absolute filesystem path where the berkeley db database file is to be
stored.
this directory must exist, and be writable
--
base/tmp/foo//base
!-- key_template (optional)
string template used to create the key for a tile entry in the
database.
defaults to the value below. you should include {tileset}, {grid} and
{dim} here
unless you know what you are doing, or you will end up with mixed tiles
key_template{tileset}-{grid}-{dim}-{z}-{y}-{x}.{ext}/key_template
--
/cache
* create the base directory and grant access to web server:
# mkdir /tmp/foo chgrp www-data /tmp/foo chmod g+rwx /tmp/foo
* set the cache element to bdb in a tileset
* populate the cache by seeding a tileset that uses a bdb-cache
* the base should look something like this:
# ls -l /tmp/foo/
insgesamt 11528
-rw-r--r-- 1 www-data www-data 9764864 Jan 28 13:30 bdb.db
-rw-r- 1 www-data www-data 24576 Jan 28 13:35 __db.001
-rw-r- 1 www-data www-data 253952 Jan 28 13:35 __db.002
-rw-r- 1 www-data www-data 1318912 Jan 28 13:35 __db.003
-rw-r- 1 www-data www-data 811008 Jan 28 13:35 __db.004
* to verify this worked use the strings command on the bdb.db and grep for the
tileset name: # strings /tmp/foo/bdb.db|grep MyTilesetName
* use the demo service to check if it is working
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Re: [mapserver-users] Mapcache: error with Berkeley DB and display tiles
Andreas, thank you very much for your time in the instructions,now the
display of tiles worked properly for Berkeley databases. I have followed
the instructions for the Apache Server. However, I'm using Nginx and
change the permissions of the Group and user as follows:
sudo chown nginx:nginx /tmp/foo sudo chmod - Rfv g+rwx /tmp/foo
Again many thanks for your help.
I have checked all types of caches, and seems to work faster with Berkeley
databases.
regards,
Samuel Mesa.
2014-01-28 Eichner, Andreas - SID-NLKM andreas.eich...@sid.sachsen.de
Andreas, thanks for the explanation about the Berkeley Database.
However, I have made several changes of permissions and owner of the
files produced by mapcache_seed, and I still get the same error on
the OpenLayers demo.
I don't know if others users have had the same error with Mapcache
and Berkeley Databases in Ubuntu Server.
Have you build mapcache yourself or do you use a prebuild one? Today I
build mapcache with BerkeleyDB support on a Debian Testing box. Basically,
this is what I did:
* check out latest master
* apt-get install libdb5.1-dev
* follow the install instructions in INSTALL, add -DWITH_BERKELEY_DB=ON to
cmake .. and make sure * Berkeley DB: /usr/lib/... is listed under
Optional components
* add the following config element to mapcache.xml if it does not exist
yet:
cache name=bdb type=bdb
!-- base (required)
absolute filesystem path where the berkeley db database file is
to be stored.
this directory must exist, and be writable
--
base/tmp/foo//base
!-- key_template (optional)
string template used to create the key for a tile entry in the
database.
defaults to the value below. you should include {tileset}, {grid}
and {dim} here
unless you know what you are doing, or you will end up with mixed
tiles
key_template{tileset}-{grid}-{dim}-{z}-{y}-{x}.{ext}/key_template
--
/cache
* create the base directory and grant access to web server:
# mkdir /tmp/foo chgrp www-data /tmp/foo chmod g+rwx /tmp/foo
* set the cache element to bdb in a tileset
* populate the cache by seeding a tileset that uses a bdb-cache
* the base should look something like this:
# ls -l /tmp/foo/
insgesamt 11528
-rw-r--r-- 1 www-data www-data 9764864 Jan 28 13:30 bdb.db
-rw-r- 1 www-data www-data 24576 Jan 28 13:35 __db.001
-rw-r- 1 www-data www-data 253952 Jan 28 13:35 __db.002
-rw-r- 1 www-data www-data 1318912 Jan 28 13:35 __db.003
-rw-r- 1 www-data www-data 811008 Jan 28 13:35 __db.004
* to verify this worked use the strings command on the bdb.db and grep for
the tileset name: # strings /tmp/foo/bdb.db|grep MyTilesetName
* use the demo service to check if it is working
--
---
.~.
/ v \
//\\
/( )\
^`~'^
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Re: [mapserver-users] Mapcache: error with Berkeley DB and display tiles
Andreas, thanks for the explanation about the Berkeley Database. However, I have made several changes of permissions and owner of the files produced by mapcache_seed, and I still get the same error on the OpenLayers demo. I don't know if others users have had the same error with Mapcache and Berkeley Databases in Ubuntu Server. Thanks again, Samuel. 2014/1/23 Eichner, Andreas - SID-NLKM andreas.eich...@sid.sachsen.de Thanks Andreas for your response. I changed all the permissions to read, write and the owner, after restarting apache, it fails displaying tiles in the demo and report the same error: failed to aquire connection to bdb backend: unknown error I followed the instructions to check the database created with db_sql according to [1] but I get the same error: db5.1_sql ortofoto.db ortoforo.db: multiple databases specified but not supported by file Error: file is encrypted or is not a database I have little knowledge of this type of database, but I would to evaluate the loading speed of tiles. It seems there is a misunderstanding of the usage of Berkley DB. BDB is a library implementing a key/value store and is quite flexible in what can be used as key and value. And that's the way MapCache uses it. The key is a string representing tileset, zoomlevel and any used dimension but at least (x, y) and the value is the image BLOB. So there will be a single BDB cache stored in a directory (because BDB uses multiple files) for all tilesets configured to use this cache. The error message you got is a mixed result of BDB (1st: multiple ...) and SQLite (2nd: file is encrypted...). This is a new feature since Oracle Berkeley DB 11g. It combines the flexibility of the SQLite database engine with the strengths of the BDB used as storage backend. See [1] for more info on that. Although both use-cases use BDB as backend they are in fact completely different and cannot be mixed together. So you cannot use dbsql to inspect the tilecache. You have to use mapcache_seed to manipulate it (seed/reseed, clean). HTH [1] http://www.oracle.com/technetwork/database/berkeleydb/overview/sql-160887.html -- --- .~. / v \ //\\ /( )\ ^`~'^ ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Mapcache: error with Berkeley DB and display tiles
On 1/24/2014, 1:50 PM, samuelm...@gmail.com wrote: Idon'tknowifothersusershave hadthesameerrorwithMapcacheandBerkeleyDatabases inUbuntuServer. Thanksagain, Samuel. I did some testing a while back with BDB and MapCache on Windows; it was working, but there was one small issue. I believe I filed a ticket for that, but it is unrelated to your problem. (oh here was the ticket https://github.com/mapserver/mapcache/issues/58) -jeff -- Jeff McKenna MapServer Consulting and Training Services http://www.gatewaygeomatics.com/ ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Mapcache: error with Berkeley DB and display tiles
Jeff, I checked your ticket previously, and it may be the same error. So far I have not been able to solve the problem of displaying of BDB cache, so this is probably a bug. Samuel. 2014/1/24 Jeff McKenna jmcke...@gatewaygeomatics.com On 1/24/2014, 1:50 PM, samuelm...@gmail.com wrote: Idon'tknowifothersusershave hadthesameerrorwithMapcacheandBerkeleyDatabases inUbuntuServer. Thanksagain, Samuel. I did some testing a while back with BDB and MapCache on Windows; it was working, but there was one small issue. I believe I filed a ticket for that, but it is unrelated to your problem. (oh here was the ticket https://github.com/mapserver/mapcache/issues/58) -jeff -- Jeff McKenna MapServer Consulting and Training Services http://www.gatewaygeomatics.com/ ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users -- --- .~. / v \ //\\ /( )\ ^`~'^ ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Mapcache: error with Berkeley DB and display tiles
failed to aquire connection to bdb backend: unknown error How can I fix or connect to the Berkeley DB?. I'm using Ubuntu Server 12.05 and Berkeley 5.1 (libdb5.1) Have you checked the file permissions to allow access to the user the web server runs under? ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Mapcache: error with Berkeley DB and display tiles
Thanks Andreas for your response. I changed all the permissions to read, write and the owner, after restarting apache, it fails displaying tiles in the demo and report the same error: failed to aquire connection to bdb backend: unknown error I followed the instructions to check the database created with db_sql according to [1] but I get the same error: db5.1_sql ortofoto.db ortoforo.db: multiple databases specified but not supported by file Error: file is encrypted or is not a database I have little knowledge of this type of database, but I would to evaluate the loading speed of tiles. Regards, Samuel Mesa. [1] https://github.com/mapserver/mapcache/issues/58 2014/1/22 Eichner, Andreas - SID-NLKM andreas.eich...@sid.sachsen.de failed to aquire connection to bdb backend: unknown error How can I fix or connect to the Berkeley DB?. I'm using Ubuntu Server 12.05 and Berkeley 5.1 (libdb5.1) Have you checked the file permissions to allow access to the user the web server runs under? -- --- .~. / v \ //\\ /( )\ ^`~'^ ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
[mapserver-users] Mapcache: error with Berkeley DB and display tiles
Hi, I am creating a cache with Berkeley DB, mapcache_seed successfully generate tiles, but when it display the tiles, reports the following error: failed to aquire connection to bdb backend: unknown error How can I fix or connect to the Berkeley DB?. I'm using Ubuntu Server 12.05 and Berkeley 5.1 (libdb5.1) Thanks, SamTux -- --- .~. / v \ //\\ /( )\ ^`~'^ ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
