To extend a logical volume after increasing the disk size, lets say AWS EBS:
sudo pvresize /dev/sdb
sudo lvextend -l +100%FREE /dev/vgName/lvName
sudo resize2fs /dev/vgName/lvName
denzhel
/ extend_lvm.md
Last active
January 21, 2021 21:31
Linux: extend LV after increase the disk size
To create a ssh key:
ssh-keygen -f ~/.ssh/keyName_rsa -t rsa -b 4096Then, upload it to AWS Secret Manager to be used as Terraform key_name when creating instances for example:
aws secretsmanager create-secret --name "Path/To/KeyName" --description "Added Manually" --secret-string "$(cat ~/.ssh/keyName_rsa.pub)"
denzhel
/ elastic_blocked_index.md
Last active
January 22, 2021 23:07
— forked from hkulekci/solve.md
Elasticsearch "blocked by: [FORBIDDEN/12/index read-only / allow delete (api)" error
If you are getting the following error while indexing:
{
"error": {
"root_cause": [
{
"type": "cluster_block_exception",
"reason": "blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];"
}
To get information about disk usage on every elasticsearch node:
curl -XGET "http://localhost:9200/_cat/allocation?v&pretty"
denzhel
/ mongo_shell_collections.md
Last active
January 26, 2021 18:50
Show collections for the specific database
To show all collections for the specific database:
mongo <dbName> --quiet --eval "db.getCollectionNames().join('\n')”
denzhel
/ kubernetes_pods_nodes_location.md
Created
January 24, 2021 09:05
Where my pods are running
If you want to know on which nodes your pods are running, use this alias:
konode='k get pod -o=custom-columns=NAME:.metadata.name,STATUS:.status.phase,NODE:.spec.nodeName'
denzhel
/ es_download_docs_from_index.md
Last active
January 26, 2021 13:15
Elasticsearch download all documents from an index
To download all documents from an index, first you need to create a search ID:
curl -X POST "localhost:9200/<indexName>/_search?scroll=5m&pretty&size=10000"This will keep a search session for 5 minutes
Then, send another query to scroll through the pages of data until there is no more:
curl -X GET "localhost:9200/_search/scroll?pretty&scroll=5m&scroll_id=<searchIdFromThePreviousStep>"
denzhel
/ mongo_export_collections.md
Last active
January 26, 2021 21:32
Export all collections from a database
If you want to export specific collections from a specific database, you can use this bash loop:
for collection in \
$(mongo <databaseName> --quiet --eval "rs.slaveOk(); db.getCollectionNames().join('\n')" | grep <collectionPrefix) ; \
do mongoexport --collection=$collection --db=<databaseName> --out=$collection ; \
done
denzhel
/ elasticsearch_disk_usage.md
Created
January 28, 2021 06:26
Query elasticsearch cluster for disk usage
Use this to query the disk usage of your elasticsearch cluster:
curl -XGET "http://localhost:9200/_cat/allocation?v&pretty"Output:
shards disk.indices disk.used disk.avail disk.total disk.percent host ip node
3213 460.2gb 584.9gb 1.3tb 1.9tb 29 1.1.1.1 1.1.1.1 host1.example.com
3213 479.5gb 599.3gb 1.3tb 1.9tb 29 1.1.1.2 1.1.1.2 host2.example.com
denzhel
/ git_show_commits_file.md
Last active
January 28, 2021 06:28
Show all commits that changed a file
If you want to know when and who changed a specific file in your Github repo:
git log --follow -- <fileName>OlderNewer