cloud engineer
If you have to download a file from the Internet on a Windows server, can certainly use the browser. But if the browser is rendering the file instead of downloading them, you may have to use the curl command which is already pre-installed on most Windows servers. Just open the command line. Here’s the the curl command to download a file.
curl.exe --output index.txt --url https://website.domain/index.txt |
Here’s how to setup a Network Load Balancer in GCP.
Setup your instances.
# Instance 1 gcloud compute instances create www1 \ --image-family debian-9 \ --image-project debian-cloud \ --zone us-central1-b \ --tags network-lb-tag \ --metadata startup-script="#! /bin/bash sudo apt-get update sudo apt-get install apache2 -y sudo service apache2 restart echo '<!doctype html><html><body><h1>www1</h1></body></html>' | tee /var/www/html/index.html EOF" # Instance 2 gcloud compute instances create www2 \ --image-family debian-9 \ --image-project debian-cloud \ --zone us-central1-b \ --tags network-lb-tag \ --metadata startup-script="#! /bin/bash sudo apt-get update sudo apt-get install apache2 -y sudo service apache2 restart echo '<!doctype html><html><body><h1>www2</h1></body></html>' | tee /var/www/html/index.html EOF" # Instance 3 gcloud compute instances create www3 \ --image-family debian-9 \ --image-project debian-cloud \ --zone us-central1-b \ --tags network-lb-tag \ --metadata startup-script="#! /bin/bash sudo apt-get update sudo apt-get install apache2 -y sudo service apache2 restart echo '<!doctype html><html><body><h1>www3</h1></body></html>' | tee /var/www/html/index.html EOF" |
Create a firewall to allow external traffic to reach port 80.
gcloud compute firewall-rules create www-firewall-network-lb \
--target-tags network-lb-tag --allow tcp:80 |
Configure your network load balancer.
# Create an external IP address. gcloud compute addresses create network-lb-ip-1 \ --region us-central1 # Add a legacy HTTP health check. gcloud compute http-health-checks create basic-check # Add a target pool. gcloud compute target-pools add-instances www-pool \ --instances www1,www2,www3 \ --instances-zone us-central1-b # Add a forwarding rule. gcloud compute forwarding-rules create www-rule \ --region us-central1 \ --ports 80 \ --address network-lb-ip-1 \ --target-pool www-pool # Lookup external IP address. gcloud compute forwarding-rules describe www-rule \ --region us-central1 |
Finally, use the curl command to send traffic to the NLB external IP address.
while true; do curl -m1 [IP_ADDRESS]; done |
You can use the curl command to test if your load balancer is working as expected. The curl command will alternately and randomly access several instances in your load balancer. If you have 3 instances behind your load balancer, it will be cycled across all 3. The -m1 command means max time is set to 1 second.
while true; do curl -m1 [IP_ADDRESS]; done |
Test if the GCP Load Balancer is working by sending a curl command from the backend VM.
Assume the load balancer IP address is 10.1.2.99, and the VM is called vm-a1.
curl http://10.1.2.99 |
The end result is …
Page served from: vm-a1 |
Make sure there’s an entry in the local table that matches the IP of the load balancer.
ip route show table local | grep 10.1.2.99 |
If not, add it.
ip route add to local 10.1.2.99/32 dev eth0 proto 66 |
If you’re still running older versions of CodeIgniter, here are a couple of tips to make it work with PHP7.
Considering v2.1.3 is very old (currently 3.1.10) , I’m surprised it works with PHP7 with just a few modifications.
Get the weather report right from your terminal.
curl wttr.in |
Here’s the output.
I’ve installed Laravel at least a dozen times. Each time, there’s always something new that goes awry during the installation. If it’s not curl, it’s mcrypt, or maybe the app/storage permissions. I think it’s just the fact that I’m experimenting where to put the Laravel files each time I install. It’s either /var/www or /home/user/. I’m using the Ubuntu standard PHP5 install. You have to specifically install php5-curl in addition to the standard PHP package. I think mcrypt is already in the PHP5 package, but to be sure I added it to the install. Here’s the command.
PHP
sudo apt-get install php5 php5-curl php5-mcrypt |
App/storage
cd /home/user/laravel/app/ chmod -R o+x storage |
These two things seem to solve most of the Laravel installation issues.