Articles, notes and random thoughts on Software Development and Technology
To ssh into AWS ec2 instances the default user id is usually ‘ec2-user’ (see my ec2 ssh checklist here).
Lightsail vps instances appear to use different default userids, depending on the OS. For example, for an Ubuntu Lightsail instance the default ssh userid is ‘ubuntu’:
ssh -i path-to-your-ssh-pen-file ubuntu@your-instance-ip
By default, if you provision and attach additional EBS volumes for an EC2 instance, they don’t get mounted by default.
The boot EBS is usually /dev/xvda1. Each additional EBS volume should be /dev/xvdb and so on.
First format the new volume:
sudo mkfs -t ext4 /dev/xvdb
Make a mount mount directory like /data, then mount it with:
sudo mount /dev/xvdb /data
Now you should see the new volume available:
$ df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 3.9G 0 3.9G 0% /dev tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs 3.9G 432K 3.9G 1% /run tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/xvda1 20G 8.8G 12G 44% / tmpfs 798M 0 798M 0% /run/user/1000 /dev/xvdb 7.8G 36M 7.3G 1% /data
Add a line to /etc/fstab to mount on startup:
/dev/xvdb /data ext4 defaults,nofail 0 2
These steps are from multiple places, mainly answers to this question.
A few useful tips from previous posts:
Install:
sudo yum install docker -y
Start service:
sudo systemctl start docker
Add user to docker group to allow running docker command without sudo:
I’m using the AWS Amazon Linux 2 AMI on my EC2. To download the Oracle Instant Client get the download urls for the instant client and instant client tools from: https://www.oracle.com/database/technologies/instant-client/linux-x86-64-downloads.html
Download using curl and install with rpm:
curl instant-client-url-from-page-above --output instant-client.rpm rpm -i instant-client.rpm curl instant-client-tools-from-page-above --output instant-client-tools.rpm rpm -i instant-client-tools.rpm
To connect using sql-plus:
sqlplus 'admin@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=your-instance-endpoint.rds.amazonaws.com)(PORT=1521))(CONNECT_DATA=(SID=your-db-name)))'
Enter password when prompted.