@@ -52,11 +52,22 @@ By giving the tables indexes, we can optimize the database for faster lookups. W
...
@@ -52,11 +52,22 @@ By giving the tables indexes, we can optimize the database for faster lookups. W
```create index on pictures (pictureid);```
```create index on pictures (pictureid);```
By running the code explain SELECT picture FROM pictures WHERE pictureid = '7VAgCDqHlheLtNK5wjiApbjylVj63L.jpg';
By running the code ```explain SELECT picture FROM pictures WHERE pictureid = '7VAgCDqHlheLtNK5wjiApbjylVj63L.jpg';``` we now see that the database only searched for 1 row to find the picture with this id. This is because this picture-id is the first picture in the database. Without indexes in the database, running the code above would take longer time and give the output "FULL SCAN" instead of "1 row" in the "estimated row count" line.
<img src="./bilder/task2_w5.png">
<img src="./bilder/task2_w5.png">
We also run this commands for indexing the other tables in the database as well:
```
create index on users (name);
create index on users (userid);
create index on users (lastpostdate);
create index on posts (userid);
create index on posts (postdate);
create index on comments (postid,postdate);
create index on comments (postid);
```
### 3) Docker image for webserver
### 3) Docker image for webserver
We make our docker file with all configs integrated, mainly because we couln't figure out how shared volumes worked. This is our dockerfile as of 13.13.2023:
We make our docker file with all configs integrated, mainly because we couln't figure out how shared volumes worked. This is our dockerfile as of 13.13.2023:
...
@@ -387,10 +398,47 @@ Our procedure for closing and opening production can be found under /prosedyrer
...
@@ -387,10 +398,47 @@ Our procedure for closing and opening production can be found under /prosedyrer
## Week 7 - Memcache
## Week 7 - Memcache
*Docker Method*
### Alternative 2, Docker Method
To install memcache, we used the 2. alternative, by installing a memcache docker image on our webserver, www3. By running this command, we create and starts the officiall memcache image:
```
docker run --name=memcache -p 11211:11211 -d 192.168.130.6:5000/memcached memcached -m 128
```
The ip-adress is the webservers ip-adress. We give the image 128 GB RAM to use.
To install memcache, we
First we need to install this library:
```apt-get install -y php-memcache```. Without this library, we will get an error when we make changes to the config.php file in bookface.
The we add these lines to the config.php:
```
$memcache_server = "192.168.130.6:11211";
$memcache_enabled = 1;
$memcache_enabled_pictures = 1;
```
The ip-adress in the code above is webserver.
These lines is added to the config.php in all of the webserver images(we have three). The output of the docker ps command will now look like this:
```
root@www3:/# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
ed5e6c6f6a0c webserver:latest "/usr/sbin/apache2ct…" 2 weeks ago Up 18 hours 0.0.0.0:32770->80/tcp, :::32770->80/tcp dwww3
414c47dad476 webserver:latest "/usr/sbin/apache2ct…" 2 weeks ago Up 18 hours 0.0.0.0:32769->80/tcp, :::32769->80/tcp dwww2
367938a83d1b webserver:latest "/usr/sbin/apache2ct…" 2 weeks ago Up 18 hours 0.0.0.0:32768->80/tcp, :::32768->80/tcp dwww1
6ddb0327815d fallbackwebserver:v4 "/usr/sbin/apache2ct…" 2 weeks ago Up 18 hours 0.0.0.0:80->80/tcp, :::80->80/tcp dwwwFallback2
659d225688ac webserver:v18 "/usr/sbin/apache2ct…" 3 weeks ago Up 18 hours 0.0.0.0:32772->80/tcp, :::32772->80/tcp cwww
d8d7e161a78a 192.168.128.23:5000/memcached "docker-entrypoint.s…" 4 weeks ago Up 18 hours 0.0.0.0:11211->11211/tcp, :::11211->11211/tcp memcache
```
We can, by looking at the picture, verify that the docker memcache instance is indeed running.
### Check whether the memcache setup works:
By running this command, we get the following output:
