Installing an ICAgent

ICAgents collect metrics, logs, and application performance data in real time. For hosts purchased from the ECS or BMS console, you need to manually install the ICAgent. For hosts purchased from the CCE console, the ICAgent is automatically installed.

AOM and LTS use the same ICAgent functions. All metric data collected by ICAgents will be reported to AOM for analysis and processing. However, for logs, only those matching the latest log collection configuration in the system will be collected.

For example, if you configure log collection paths in AOM for ECSs, the previous LTS collection configurations of all ECSs under the resource set become invalid.

The following table describes the ICAgent status.

**Table 1** ICAgent status
Status	Description
Running	The ICAgent is running properly.
Uninstalled	The ICAgent is not installed. For details about how to install an ICAgent, see Installing an ICAgent.
Installing	The ICAgent is being installed. This operation takes about 1 minute to complete.
Installation failed	Failed to install the ICAgent. Uninstall the ICAgent according to Uninstalling the ICAgent by Logging In to the Server and then install it again.
Upgrading	The ICAgent is being upgraded. This operation takes about 1 minute to complete.
Upgrade failed	Failed to upgrade the ICAgent. Uninstall the ICAgent according to Uninstalling the ICAgent by Logging In to the Server and then install it again.
Offline	The ICAgent is abnormal due to network problems. Check and restore the network.
Abnormal	The ICAgent is abnormal. Contact technical support.

Prerequisites

Before installing an ICAgent, ensure that the time and time zone of the local browser are consistent with those of the server. If multiple servers are deployed, ensure that the local browser and multiple servers use the same time zone and time. Otherwise, metric data of applications and servers displayed on the UI may be incorrect.

Installation Methods

There are two methods to install an ICAgent. Note that the two methods are not applicable to container nodes created through ServiceStage or CCE. For container nodes, you do not need to manually install an ICAgent. Instead, you only need to perform certain operations when creating clusters or deploying applications.

For details, see Table 2.

**Table 2** Installation methods
Method	Scenario
Initial installation	This method is used when the following condition is met: An ICAgent has never been installed on your server.
Inherited installation	This method is used when the following conditions are met: You need to install ICAgents on multiple servers. An ICAgent has been installed on one of the servers. All the servers are in the same VPC. If the servers are not in the same VPC, bind EIPs to them before using this installation method.

Initial Installation

After you apply for a server and install an ICAgent for the first time, perform the following operations:

Obtain an Access Key ID/Secret Access Key (AK/SK).
- If you have obtained the AK/SK, skip this step.
- If you have not obtained an AK/SK, obtain them first.
In the navigation pane, choose Configuration Management > Agent Management.
Select Other: custom hosts, and click Install ICAgent.
Click Copy Command to copy the installation command.
Use a remote login tool to log in to the target server as the root user, and run the following command to disable historical record collection:

set +o history
Run the copied installation command and enter the obtained AK and SK as prompted.
After the ICAgent is installed, run the following command to enable historical record collection:
set -o history
- If the message ICAgent install success is displayed, the ICAgent has been installed in the /opt/oss/servicemgr/ directory. After the ICAgent has been installed, choose Configuration Management > Agent Management to view the ICAgent status.
- If the ICAgent fails to be installed, uninstall the ICAgent according to Uninstalling the ICAgent by Logging In to the Server and then install it again. If the problem persists, contact technical support.

Inherited Installation

If an ICAgent has been installed on a server and the ICProbeAgent.zip installation package exists in the /opt/ICAgent/ directory of this server, use this method to install an ICAgent on a remote server with a few clicks.

Run the following command (x.x.x.x indicates the server IP address) on the server where an ICAgent has been installed:

bash /opt/oss/servicemgr/ICAgent/bin/remoteInstall/remote_install.sh -ip x.x.x.x
Enter the password of the root user as prompted.
- Inherited installation is not supported when ICAgents are installed using an IAM agency.
- If both the expect tool and the ICAgent have been installed on the server, an ICAgent will be installed on the remote server after the preceding command is executed. If an ICAgent has been installed on the server, but the Expect tool has not, enter the information as prompted for installation.
- Ensure that the root user can run the SSH or SCP command on the server where an ICAgent has been installed to remotely communicate with the server where an ICAgent is to be installed.
- If the message ICAgent install success is displayed, the ICAgent has been installed in the /opt/oss/servicemgr/ directory. After the ICAgent has been installed, choose Configuration Management > Agent Management to view the ICAgent status.
- If the ICAgent fails to be installed, uninstall the ICAgent according to Uninstalling the ICAgent by Logging In to the Server and then install it again. If the problem persists, contact technical support.

Inherited Batch Installation

Ensure that you can run the SSH and SCP commands on the server where an ICAgent has been installed to communicate with the remote servers where an ICAgent is to be installed.
If you have installed an ICAgent in a server through an agency, you also need to set an agency for other servers where an ICAgent is to be installed.
Batch installation scripts depend on Python versions. You are advised to implement batch installation on hosts running Python 3.x.
Press Enter at the end of each line in the iplist.cfg file.

Prerequisites

The IP addresses and passwords of all servers on which an ICAgent is to be installed have been collected, sorted in the iplist.cfg file, and uploaded to the /opt/ICAgent/ directory on the server where an ICAgent has been installed. The following is an example of the iplist.cfg file, where IP addresses and passwords are separated by spaces.

192.168.0.109 password (Set the password as required.)

192.168.0.39 password (Set the password as required.)

Because the iplist.cfg file contains sensitive information, you are advised to clear the information in time.

If the passwords of all servers are the same, list IP addresses in the iplist.cfg file and enter the password during execution. If the password of an IP address is different from those of other IP addresses, enter the password next to this IP address.
Batch installation depends on Python 3.x. If the system displays a message indicating that Python cannot be found during the installation, install Python and try again.
Before the installation, check whether the Python command file exists. If the file does not exist, create a soft link.

Procedure

Run the following command on the server where an ICAgent has been installed:

bash /opt/oss/servicemgr/ICAgent/bin/remoteInstall/remote_install.sh -batchModeConfig /opt/ICAgent/iplist.cfg

Enter the preset password of the root user as prompted. If the passwords of all IP addresses have been configured in the iplist.cfg file, press Enter to skip this step. Otherwise, enter the preset password.
```
batch install begin
Please input default passwd:
send cmd to 192.168.0.109
send cmd to 192.168.0.39
2 tasks running, please wait...
2 tasks running, please wait...
2 tasks running, please wait...
End of install agent: 192.168.0.39
End of install agent: 192.168.0.109
All hosts install icagent finish.
```
Wait until the message All hosts install icagent finish. is displayed, which indicates that the ICAgent has been installed on all the hosts listed in the configuration file.
After the ICAgent has been installed, choose Configuration Management > Agent Management to view the ICAgent status.