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cloud engineer

disable

CloudWatch Notifications

How to give someone access to enable/disable CloudWatch notifications.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "cloudwatch:DescribeAlarms",
                "cloudwatch:EnableAlarmActions",
                "cloudwatch:DisableAlarmActions"
            ],
            "Effect": "Allow",
            "Resource": "*"
        }
    ]
}

Enable Core Dumps

Core dumps are triggered by kernel when a program crashses. It saves memory to a file.

How to enable core dumps.

ulimit -S -c unlimited

Enable core dumps permanently. Edit /etc/security/limits.conf. Add the following.

* soft core unlimited

Disable core dumps.

ulimit -S -c 0

Disable core dumps permanently. Edit /etc/security/limits.conf. Add the following.

* soft core 0
* hard core 0

AWS CloudWatch Alarms

How to enable and disable CloudWatch alarms

$ aws cloudwatch disable-alarm-actions --alarm-names myalarm --region us-east-1
$ aws cloudwatch enable-alarm-actions --alarm-names myalarm --region us-east-1

Winbind Fix

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

Disable Gutenberg

Two years ago, WordPress introduced Gutenberg block editor together with the release of WordPress version 5.0. Gutenberg essentially became the default editor starting with WordPress version 5.0. While many people love the Gutenberg editor, some people hate it. If you’re one of the many people who hate the Gutenberg editor, you can simply disable it by installing a plugin called Disable Gutenberg. This plugin will revert back to the classic editor.

Once installed, you should be able to see the Classic editor.

After working with Gutenberg for so long, I forgot the speed and agility of the classic editor. It’s much faster.

AWS CLI IAM Keys

Here’s a few commands to create, delete and disable AWS user keys.

List user keys.

aws iam list-access-keys --user-name john.doe

Create access key. Results are printed on screen in JSON format.

aws iam create-access-key --user-name john.doe

Disable a key. The real key id is obfuscated.

aws iam update-access-key \
--access-key-id ******************** \
--status Inactive \
--user-name john.doe

Delete a key. They real key id is obfuscated.

aws iam delete-access-key \
--access-key-id ******************** \
--user-name john.doe