cloud engineer
iptables can be saved or loaded from a file. Here’s a way to do it.
Saving to a file
# Debian/Ubuntu iptables-save > /etc/iptables/rules.v4 # Redhat/Centos/Rocky iptables-save > /etc/sysconfig/iptables |
Loading from a file
# Debian/Ubuntu iptables-restore > /etc/iptables/rules.v4 # Redhat/Centos/Rocky iptables-restore > /etc/sysconfig/iptables |
Listing rules
iptables -L |
Here’s the process to restore Winbind.
Restore old config.
cp /etc/sssd/sssd.conf-xxxxxxx /etc/sssd/sssd.conf cp /etc/krb5.conf-xxxxxxx /etc/krb5.conf |
Disable SSSD. Authconfig creates /etc/nswitch.conf.
authconfig --disablesssd --disablesssdauth --updateall |
Start Winbind.
service winbind start; service smb start; service nmb start |
If you have an existing EFS that’s unencrypted, you can encrypt it be creating a snapshot using AWS Backup, and then restoring the file system to a new EFS with encryption. If you choose to restore in a directory in the same file system, it will not be encrypted. It has to be a new EFS. In addition, you’ll be asked to select which encryption key to use. The default key will work, unless you have your own.
In order to restore a MySQL database to another database, use routines and triggers.
mysqldump -p user -p --routines --triggers db1 > db1.sql |
To restore to another database, just use the normal command.
mysql -u user -p db2 < db1.sql |
Here’s how to restore a MySQL database from mysqldump.
mysql -u user -p mysql> drop database databasename; mysql> quit; Bye mysql -u user -p databasename < filename.sql |
Drop database first, then import the SQL file.
How to convert Persistent Standard disk to SSD.
First create a snapshot of the disk.
gcloud compute disks snapshot your-server \ --snapshot-names manual-snapshot-disk-1 \ --project your-project \ --zone us-central1-c |
Restore snapshot to SSD format.
gcloud compute disks create disk-1-ssd \ --source-snapshot manual-snapshot-disk-1 \ --project your-project \ --zone us-central1-a \ --type pd-ssd \ --size 10GB |
Swap disks using GCP attach and detach.
How to restore an object from Amazon S3 Glacier via the AWS CLI.
aws s3api restore-object \ --bucket awsexamplebucket \ --key dir1/example.obj \ --restore-request '{"Days":25,"GlacierJobParameters":{"Tier":"Standard"}}' |
How to restore from GCP Snapshots. Let’s say you have an instance called webserver with 2 disks.
Restore from snapshots:
gcloud compute disks create webserver-boot-r \ --project=your-project \ --source-snapshot=webserver-boot-190616 \ --zone=us-central1-a gcloud compute disks create webserver-data-r \ --project=your-project \ --source-snapshot=webserver-data-190616 \ --zone=us-central1-a |
Stop instance. Detach and attach disks:
gcloud compute instances detach-disk webserver --disk=webserver-boot --zone us-central1-a gcloud compute instances attach-disk webserver --disk=webserver-boot-r --zone us-central1-a --boot gcloud compute instances detach-disk webserver --disk=webserver-data --zone us-central1-a gcloud compute instances attach-disk webserver --disk=webserver-data-r --zone us-central1-a |
Boot instance.