diff --git a/linux/docker install.md b/linux/docker install.md
index 98765c1..cac3c86 100644
--- a/linux/docker install.md	
+++ b/linux/docker install.md	
@@ -1,5 +1,7 @@
 # install
 sudo apt-get update
+sudo apt update
+sudo apt install gnupg
 sudo apt-get install apt-transport-https ca-certificates curl software-properties-common
 curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
 sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
@@ -9,6 +11,11 @@ sudo apt-get install docker-ce
 # add portainer
 docker run -d -p 8000:8000 -p 9000:9000 --name=portainer --restart=always --pull=always -v /var/run/docker.sock:/var/run/docker.sock -v /mnt/storage/docker_volumes/portainer_data:/data portainer/portainer-ce
 
+# change portainer admin password
+docker stop portainer
+docker pull portainer/helper-reset-password
+docker run --rm -v /mnt/storage/docker_volumes/portainer_data:/data portainer/helper-reset-password
+
 
 # start
 sudo systemctl start docker
@@ -17,3 +24,7 @@ sudo systemctl enable docker
 
 # build image
 sudo docker build -t your-image-name .
+
+# attach to container
+docker exec -it potainer /bin/sh
+