bsnyder

DISTINGUISHING MESSAGE DURABILITY FROM MESSAGE PERSISTENCE

Two points within JMS that are often confused are message durability and message persistence. Though they’re similar, there are some semantic differences between them and each has its specific purpose. Message durability can only be achieved with the pub/sub domain. When clients connect to a topic, they can do so using a durable or a nondurable subscription. Consider the differences between the two:

* Durable subscription—A durable subscription is infinite. It’s registered with the topic subscription to tell the JMS provider to preserve the subscription state in the event that the subscriber disconnects. If a durable subscriber disconnects, the JMS provider will hold all messages until that subscriber connects again or
until the subscriber explicitly unsubscribes from the topic.
* Nondurable subscription—A nondurable subscription is finite. It’s registered with
the topic subscription to tell the JMS provider to not preserve the subscription state in

bsnyder

### Keybase proof

I hereby claim:

  * I am bsnyder on github.
  * I am bsnyder (https://keybase.io/bsnyder) on keybase.
  * I have a public key whose fingerprint is 910A D992 C9CF 79F3 7804  AB90 FEEA 5B23 2C98 3957

To claim this, I am signing this object:

bsnyder

$ curl https://shellshocker.net/shellshock_test.sh | bash
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  2009  100  2009    0     0   3044      0 --:--:-- --:--:-- --:--:--  3240
CVE-2014-6271 (original shellshock): not vulnerable
bash: shellshocker: command not found
CVE-2014-6278 (Florian's patch): not vulnerable
CVE-2014-7169 (taviso bug): not vulnerable
CVE-2014-//// (exploit 3 on http://shellshocker.net/): not vulnerable
CVE-2014-7186 (redir_stack bug): not vulnerable

bsnyder

$ curl https://shellshocker.net/shellshock_test.sh | /bin/bash
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  2009  100  2009    0     0   6200      0 --:--:-- --:--:-- --:--:--  6258
CVE-2014-6271 (original shellshock): not vulnerable
bash: shellshocker: command not found
CVE-2014-6278 (Florian's patch): not vulnerable
CVE-2014-7169 (taviso bug): not vulnerable
CVE-2014-//// (exploit 3 on http://shellshocker.net/): not vulnerable
CVE-2014-7186 (redir_stack bug): not vulnerable

bsnyder

$ sudo port selfupdate
Password:
--->  Updating MacPorts base sources using rsync
MacPorts base version 2.3.1 installed,
MacPorts base version 2.3.1 downloaded.
--->  Updating the ports tree
--->  MacPorts base is already the latest version

The ports tree has been updated. To upgrade your installed ports, you should run
  port upgrade outdated

bsnyder

$ sudo port search postgresql | grep '^postgresql\d\d'
postgresql80 @8.0.26 (databases)
postgresql80-doc @8.0.26 (databases)
postgresql80-server @8.0.26 (databases)
postgresql81 @8.1.23 (databases)
postgresql81-doc @8.1.23 (databases)
postgresql81-server @8.1.23 (databases)
postgresql82 @8.2.23 (databases)
postgresql82-doc @8.2.23 (databases)
postgresql82-server @8.2.23 (databases)

bsnyder

$ sudo port install postgresql94 postgresql94-server postgresql94-doc

bsnyder

$ sudo mkdir -p /opt/local/var/db/postgresql94/defaultdb

$ sudo chown postgres:postgres /opt/local/var/db/postgresql94/defaultdb

$ sudo su postgres -c '/opt/local/lib/postgresql94/bin/initdb -D /opt/local/var/db/postgresql94/defaultdb'

bsnyder

$ printf '%s\n\n%s' '#!/bin/bash' 'su postgres -c "/opt/local/lib/postgresql94/bin/pg_ctl -D /opt/local/var/db/postgresql94/defaultdb -l /opt/local/var/db/postgresql94/defaultdb/postgresql.log start"' > ~/bin/pg_start.sh
$ chmod +x ~/bin/pg_start.sh
$ printf '%s\n\n%s' '#!/bin/bash' 'sudo su postgres -c "/opt/local/lib/postgresql94/bin/pg_ctl -D /opt/local/var/db/postgresql94/defaultdb stop"' > ~/bin/pg_stop.sh
$ chmod +x ~/bin/pg_stop.sh

bsnyder

$ sudo tail -f /opt/local/var/db/postgresql94/defaultdb/postgresql.log